nih-gov/www.ncbi.nlm.nih.gov/omim/182600

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Entry
- #182600 - SPASTIC PARAPLEGIA 3, AUTOSOMAL DOMINANT; SPG3A
- OMIM
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<span class="h4">#182600</span>
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<strong>Table of Contents</strong>
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<a href="#title"><strong>Title</strong></a>
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<a href="#phenotypeMap"><strong>Phenotype-Gene Relationships</strong></a>
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<a href="/clinicalSynopsis/182600"><strong>Clinical Synopsis</strong></a>
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<a href="/phenotypicSeries/PS303350"> <strong>Phenotypic Series</strong> </a>
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<a href="#text"><strong>Text</strong></a>
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<a href="#description">Description</a>
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<li role="presentation" style="margin-left: 1em">
<a href="#clinicalFeatures">Clinical Features</a>
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<li role="presentation" style="margin-left: 1em">
<a href="#inheritance">Inheritance</a>
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<li role="presentation" style="margin-left: 1em">
<a href="#diagnosis">Diagnosis</a>
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<a href="#populationGenetics">Population Genetics</a>
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<a href="#mapping">Mapping</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<a href="#seeAlso"><strong>See Also</strong></a>
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<a href="#references"><strong>References</strong></a>
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<a href="#contributors"><strong>Contributors</strong></a>
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<a href="#creationDate"><strong>Creation Date</strong></a>
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<div><a href="https://clinicaltrials.gov/search?cond=SPASTIC PARAPLEGIA 3, AUTOSOMAL DOMINANT" class="mim-tip-hint" title="A registry of federally and privately supported clinical trials conducted in the United States and around the world." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Clinical Trials', 'domain': 'clinicaltrials.gov'})">Clinical Trials</a></div>
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<div><a href="https://www.alliancegenome.org/disease/DOID:0110791" class="mim-tip-hint" title="Search Across Species; explore model organism and human comparative genomics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Alliance Genome', 'domain': 'alliancegenome.org'})">Alliance Genome</a></div>
<div><a href="http://www.informatics.jax.org/disease/182600" class="mim-tip-hint" title="Phenotypes, alleles, and disease models from Mouse Genome Informatics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MGI Mouse Phenotype', 'domain': 'informatics.jax.org'})">MGI Mouse Phenotype</a></div>
<div><a href="https://wormbase.org/resources/disease/DOID:0110791" class="mim-tip-hint" title="Database of the biology and genome of Caenorhabditis elegans and related nematodes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Disease Ontology', 'domain': 'wormbase.org'})">Wormbase Disease Ontology</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
<span>
<span class="mim-tip-bottom" qtip_title="<strong>Looking for this gene or this phenotype in other resources?</strong>" qtip_text="Select a related resource from the dropdown menu and click for a targeted link to information directly relevant.">
&nbsp;
</span>
</span>
</div>
<div class="col-lg-8 col-lg-pull-2 col-md-8 col-md-pull-2 col-sm-8 col-sm-pull-2 col-xs-12">
<div>
<a id="title" class="mim-anchor"></a>
<div>
<a id="number" class="mim-anchor"></a>
<div class="text-right">
<a href="#" class="mim-tip-icd" qtip_title="<strong>ICD+</strong>" qtip_text="
<strong>SNOMEDCT:</strong> 782670003<br />
<strong>ORPHA:</strong> 100984<br />
<strong>DO:</strong> 0110791<br />
">ICD+</a>
</div>
<div>
<span class="h3">
<span class="mim-font mim-tip-hint" title="Phenotype description, molecular basis known">
<span class="text-danger"><strong>#</strong></span>
182600
</span>
</span>
</div>
</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
SPASTIC PARAPLEGIA 3, AUTOSOMAL DOMINANT; SPG3A
</span>
</h3>
</div>
<div>
<br />
</div>
<div>
<a id="alternativeTitles" class="mim-anchor"></a>
<div>
<p>
<span class="mim-font">
<em>Alternative titles; symbols</em>
</span>
</p>
</div>
<div>
<h4>
<span class="mim-font">
SPG3<br />
STRUMPELL DISEASE<br />
FAMILIAL SPASTIC PARAPLEGIA, AUTOSOMAL DOMINANT, 1; FSP1
</span>
</h4>
</div>
</div>
<div>
<br />
</div>
</div>
<div>
<a id="phenotypeMap" class="mim-anchor"></a>
<h4>
<span class="mim-font">
<strong>Phenotype-Gene Relationships</strong>
</span>
</h4>
<div>
<table class="table table-bordered table-condensed table-hover small mim-table-padding">
<thead>
<tr class="active">
<th>
Location
</th>
<th>
Phenotype
</th>
<th>
Phenotype <br /> MIM number
</th>
<th>
Inheritance
</th>
<th>
Phenotype <br /> mapping key
</th>
<th>
Gene/Locus
</th>
<th>
Gene/Locus <br /> MIM number
</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/225?start=-3&limit=10&highlight=225">
14q22.1
</a>
</span>
</td>
<td>
<span class="mim-font">
Spastic paraplegia 3A, autosomal dominant
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182600"> 182600 </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
ATL1
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606439"> 606439 </a>
</span>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div>
<div class="btn-group ">
<a href="/clinicalSynopsis/182600" class="btn btn-warning" role="button"> Clinical Synopsis </a>
<button type="button" id="mimPhenotypicSeriesToggle" class="btn btn-warning dropdown-toggle mimSingletonFoldToggle" data-toggle="collapse" href="#mimClinicalSynopsisFold" onclick="ga('send', 'event', 'Unfurl', 'ClinicalSynopsis', 'omim.org')">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
</button>
</div>
&nbsp;
<div class="btn-group">
<a href="/phenotypicSeries/PS303350" class="btn btn-info" role="button"> Phenotypic Series </a>
<button type="button" id="mimPhenotypicSeriesToggle" class="btn btn-info dropdown-toggle mimSingletonFoldToggle" data-toggle="collapse" href="#mimPhenotypicSeriesFold" onclick="ga('send', 'event', 'Unfurl', 'PhenotypicSeries', 'omim.org')">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
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</div>
&nbsp;
<div class="btn-group">
<button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
PheneGene Graphics <span class="caret"></span>
</button>
<ul class="dropdown-menu" style="width: 17em;">
<li><a href="/graph/linear/182600" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Linear'})"> Linear </a></li>
<li><a href="/graph/radial/182600" target="_blank" onclick="gtag('event', 'mim_graph', {'destination': 'Radial'})"> Radial </a></li>
</ul>
</div>
<span class="glyphicon glyphicon-question-sign mim-tip-hint" title="OMIM PheneGene graphics depict relationships between phenotypes, groups of related phenotypes (Phenotypic Series), and genes.<br /><a href='/static/omim/pdf/OMIM_Graphics.pdf' target='_blank'>A quick reference overview and guide (PDF)</a>"></span>
<div>
<p />
</div>
<div id="mimClinicalSynopsisFold" class="well well-sm collapse mimSingletonToggleFold">
<div class="small" style="margin: 5px">
<div>
<div>
<span class="h5 mim-font">
<strong> INHERITANCE </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Autosomal dominant <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/263681008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">263681008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/771269000" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">771269000</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0443147&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0443147</a>, <a href="https://bioportal.bioontology.org/search?q=C1867440&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1867440</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000006</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> GENITOURINARY </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Bladder </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Urinary urgency <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/75088002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">75088002</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R39.15" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R39.15</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/788.63" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">788.63</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0085606&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0085606</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000012" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000012</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000012" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000012</a>]</span><br /> -
Urinary incontinence <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/165232002" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">165232002</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R32" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R32</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/788.30" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">788.30</a>, <a href="https://purl.bioontology.org/ontology/ICD9CM/788.3" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">788.3</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0042024&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0042024</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000020" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000020</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0000020" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0000020</a>]</span><br /> -
Sphincter disturbances <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1843663&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1843663</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002839" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002839</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002839" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002839</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> SKELETAL </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Spine </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Scoliosis <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/298382003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">298382003</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/20944008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">20944008</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/111266001" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">111266001</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/M41.9" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">M41.9</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/M41" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">M41</a>, <a href="https://purl.bioontology.org/ontology/ICD10CM/Q67.5" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">Q67.5</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0559260&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0559260</a>, <a href="https://bioportal.bioontology.org/search?q=C0036439&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0036439</a>, <a href="https://bioportal.bioontology.org/search?q=C0700208&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0700208</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002650" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002650</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002650" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002650</a>]</span><br />
</span>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<em> Feet </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Pes cavus in patients with early onset <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866867&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866867</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> NEUROLOGIC </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<div>
<span class="h5 mim-font">
<em> Central Nervous System </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Delayed motor development <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1854301&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1854301</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001270" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001270</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001270" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001270</a>]</span><br /> -
Lower limb spasticity <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/394679006" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">394679006</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1271100&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1271100</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002061" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002061</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002061" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002061</a>]</span><br /> -
Lower limb weakness <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1836296&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1836296</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0007340" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007340</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0007340" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0007340</a>]</span><br /> -
Lower limb atrophy <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866863&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866863</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0008944" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0008944</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0008944" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0008944</a>]</span><br /> -
Spastic gait <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/9447003" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">9447003</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/R26.1" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">R26.1</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0231687&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0231687</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002064" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002064</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002064" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002064</a>]</span><br /> -
Upper limbs may show mild involvement <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866865&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866865</a>]</span><br /> -
Hyperreflexia <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/86854008" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">86854008</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0151889&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0151889</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001347" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001347</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001347" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001347</a>]</span><br /> -
Extensor plantar responses <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/246586009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">246586009</a>, <a href="https://purl.bioontology.org/ontology/SNOMEDCT/366575004" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">366575004</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0034935&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0034935</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003487" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003487</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003487" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003487</a>]</span><br /> -
Mental retardation, mild (1 family) <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/86765009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">86765009</a>]</span> <span class="mim-feature-ids hidden">[ICD10CM: <a href="https://purl.bioontology.org/ontology/ICD10CM/F70" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD10CM\', \'domain\': \'bioontology.org\'})">F70</a>]</span> <span class="mim-feature-ids hidden">[ICD9CM: <a href="https://purl.bioontology.org/ontology/ICD9CM/317" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'ICD9CM\', \'domain\': \'bioontology.org\'})">317</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0026106&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0026106</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001256" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001256</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0001256" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0001256</a>]</span><br /> -
Thin corpus callosum (1 family) <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C5441562&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C5441562</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033725" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033725</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0033725" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0033725</a>]</span><br />
</span>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<em> Peripheral Nervous System </em>
</span>
</div>
<div style="margin-left: 2em;">
<span class="mim-font">
- Decreased vibratory sense in lower limbs after long disease duration <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866866&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866866</a>]</span><br /> -
Degeneration of the lateral corticospinal tracts <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1846566&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1846566</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002314" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002314</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0002314" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0002314</a>]</span><br />
</span>
</div>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MISCELLANEOUS </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Usually shows early age at onset (range 1 to 7 years, mean 4.6 years)<br /> -
Later onset has been rarely reported (up to age 68 years)<br /> -
Most patients need assistance walking or are wheelchair-bound<br /> -
Insidious onset <span class="mim-feature-ids hidden">[SNOMEDCT: <a href="https://purl.bioontology.org/ontology/SNOMEDCT/367326009" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'SNOMEDCT\', \'domain\': \'bioontology.org\'})">367326009</a>]</span> <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1298634&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1298634</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003587" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003587</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003587" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003587</a>]</span><br /> -
Highly variable severity <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1866862&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1866862</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003828" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003828</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003828" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003828</a>]</span><br /> -
Variable progression<br /> -
Reduced penetrance <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C1836598&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C1836598</a> HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003829" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003829</a>]</span> <span class="mim-feature-ids hidden">[HPO: <a href="https://hpo.jax.org/app/browse/term/HP:0003829" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'HPO\', \'domain\': \'hpo.jax.org\'})">HP:0003829</a>]</span><br /> -
Genetic heterogeneity <span class="mim-feature-ids hidden">[UMLS: <a href="https://bioportal.bioontology.org/search?q=C0242960&searchproperties=true" target="_blank" onclick="gtag(\'event\', \'mim_outbound\', {\'name\': \'UMLS\', \'domain\': \'bioontology.org\'})">C0242960</a>]</span><br />
</span>
</div>
</div>
</div>
<div>
<div>
<span class="h5 mim-font">
<strong> MOLECULAR BASIS </strong>
</span>
</div>
<div style="margin-left: 2em;">
<div>
<span class="mim-font">
- Caused by mutation in the atlastin gene (SPG3A, <a href="/entry/606439#0001">606439.0001</a>)<br />
</span>
</div>
</div>
</div>
<div class="text-right">
<a href="#mimClinicalSynopsisFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
</div>
</div>
</div>
<div id="mimPhenotypicSeriesFold" class="well well-sm collapse mimSingletonToggleFold">
<div class="small">
<div class="row">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<h5>
Spastic paraplegia
- <a href="/phenotypicSeries/PS303350">PS303350</a>
- 86 Entries
</h5>
</div>
</div>
<div class="row" style="margin-left: 0.125em; margin-right: 0.125em;">
<table class="table table-bordered table-condensed table-hover mim-table-padding">
<thead>
<tr>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Location</strong>
</th>
<th class="col-lg-5 col-md-5 col-sm-5 col-xs-6 text-nowrap">
<strong>Phenotype</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Inheritance</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />mapping key</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Phenotype<br />MIM number</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus</strong>
</th>
<th class="col-lg-1 col-md-1 col-sm-1 col-xs-1 text-nowrap">
<strong>Gene/Locus<br />MIM number</strong>
</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/208?start=-3&limit=10&highlight=208"> 1p36.13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617225"> Spastic paraplegia 78, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617225"> 617225 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610513"> ATP13A2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610513"> 610513 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/553?start=-3&limit=10&highlight=553"> 1p34.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619027"> Spastic paraplegia 83, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619027"> 619027 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618994"> HPDL </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618994"> 618994 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/709?start=-3&limit=10&highlight=709"> 1p31.1-p21.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609727"> Spastic paraplegia 29, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609727"> 609727 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609727"> SPG29 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609727"> 609727 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/882?start=-3&limit=10&highlight=882"> 1p13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615686"> ?Spastic paraplegia 63, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615686"> 615686 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/102771"> AMPD2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/102771"> 102771 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/935?start=-3&limit=10&highlight=935"> 1p13.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614066"> Spastic paraplegia 47, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614066"> 614066 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607245"> AP4B1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607245"> 607245 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/1617?start=-3&limit=10&highlight=1617"> 1q32.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270750"> Spastic paraplegia 23, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270750"> 270750 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612666"> DSTYK </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612666"> 612666 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/1773?start=-3&limit=10&highlight=1773"> 1q42.13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613206"> ?Spastic paraplegia 44, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613206"> 613206 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608803"> GJC2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608803"> 608803 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/1/1774?start=-3&limit=10&highlight=1774"> 1q42.13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616451"> ?Spastic paraplegia 74, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616451"> 616451 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615316"> IBA57 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615316"> 615316 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/106?start=-3&limit=10&highlight=106"> 2p23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618768"> Spastic paraplegia 81, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618768"> 618768 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607915"> SELENOI </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607915"> 607915 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/170?start=-3&limit=10&highlight=170"> 2p22.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182601"> Spastic paraplegia 4, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182601"> 182601 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604277"> SPAST </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604277"> 604277 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/325?start=-3&limit=10&highlight=325"> 2p13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620938"> Spastic paraplegia 93, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620938"> 620938 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608100"> NFU1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608100"> 608100 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/441?start=-3&limit=10&highlight=441"> 2p11.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610250"> Spastic paraplegia 31, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610250"> 610250 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609139"> REEP1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609139"> 609139 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/891?start=-3&limit=10&highlight=891"> 2q33.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605280"> Spastic paraplegia 13, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605280"> 605280 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118190"> HSPD1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/118190"> 118190 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/1177?start=-3&limit=10&highlight=1177"> 2q37.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610357"> Spastic paraplegia 30, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610357"> 610357 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601255"> KIF1A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601255"> 601255 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/2/1177?start=-3&limit=10&highlight=1177"> 2q37.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620607"> Spastic paraplegia 30, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620607"> 620607 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601255"> KIF1A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601255"> 601255 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/3/505?start=-3&limit=10&highlight=505"> 3q12.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615658"> ?Spastic paraplegia 57, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615658"> 615658 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602498"> TFG </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602498"> 602498 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/3/803?start=-3&limit=10&highlight=803"> 3q25.31 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612539"> Spastic paraplegia 42, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612539"> 612539 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603690"> SLC33A1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603690"> 603690 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/3/894?start=-3&limit=10&highlight=894"> 3q27-q28 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605229"> Spastic paraplegia 14, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605229"> 605229 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605229"> SPG14 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/605229"> 605229 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/8?start=-3&limit=10&highlight=8"> 4p16-p15 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612335"> Spastic paraplegia 38, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612335"> 612335 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612335"> SPG38 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612335"> 612335 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/174?start=-3&limit=10&highlight=174"> 4p13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620221"> Spastic paraplegia 79A, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620221"> 620221 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/191342"> UCHL1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/191342"> 191342 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/174?start=-3&limit=10&highlight=174"> 4p13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615491"> Spastic paraplegia 79B, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615491"> 615491 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/191342"> UCHL1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/191342"> 191342 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/4/471?start=-3&limit=10&highlight=471"> 4q25 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615030"> Spastic paraplegia 56, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615030"> 615030 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610670"> CYP2U1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610670"> 610670 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/5/509?start=-3&limit=10&highlight=509"> 5q31.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615625"> Spastic paraplegia 72A, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615625"> 615625 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609347"> REEP2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609347"> 609347 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/5/509?start=-3&limit=10&highlight=509"> 5q31.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620606"> ?Spastic paraplegia 72B, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620606"> 620606 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609347"> REEP2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609347"> 609347 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/6/33?start=-3&limit=10&highlight=33"> 6p25.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617046"> Spastic paraplegia 77, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/617046"> 617046 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611592"> FARS2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611592"> 611592 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/6/323?start=-3&limit=10&highlight=323"> 6p21.33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619735"> Spastic paraplegia 86, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619735"> 619735 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/142620"> ABHD16A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/142620"> 142620 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/6/851?start=-3&limit=10&highlight=851"> 6q23-q24.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608220"> Spastic paraplegia 25, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608220"> 608220 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608220"> SPG25 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608220"> 608220 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/7/37?start=-3&limit=10&highlight=37"> 7p22.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613647"> Spastic paraplegia 48, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613647"> 613647 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613653"> AP5Z1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613653"> 613653 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/7/484?start=-3&limit=10&highlight=484"> 7q22.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612936"> Spastic paraplegia 50, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612936"> 612936 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602296"> AP4M1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602296"> 602296 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/76?start=-3&limit=10&highlight=76"> 8p22 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614898"> Spastic paraplegia 53, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614898"> 614898 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609927"> VPS37A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609927"> 609927 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/154?start=-3&limit=10&highlight=154"> 8p21.1-q13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611945"> Spastic paraplegia 37, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611945"> 611945 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611945"> SPG37 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611945"> 611945 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/196?start=-3&limit=10&highlight=196"> 8p11.23 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611225"> Spastic paraplegia 18B, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611225"> 611225 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611605"> ERLIN2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611605"> 611605 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/196?start=-3&limit=10&highlight=196"> 8p11.23 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620512"> Spastic paraplegia 18A, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620512"> 620512 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611605"> ERLIN2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611605"> 611605 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/207?start=-3&limit=10&highlight=207"> 8p11.23 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615033"> Spastic paraplegia 54, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615033"> 615033 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615003"> DDHD2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615003"> 615003 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/240?start=-3&limit=10&highlight=240"> 8p11.21 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619686"> Spastic paraplegia 85, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619686"> 619686 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614649"> RNF170 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614649"> 614649 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/303?start=-3&limit=10&highlight=303"> 8q12.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270800"> Spastic paraplegia 5A, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270800"> 270800 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603711"> CYP7B1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603711"> 603711 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/8/538?start=-3&limit=10&highlight=538"> 8q24.13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603563"> Spastic paraplegia 8, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603563"> 603563 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610657"> WASHC5 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610657"> 610657 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/9/175?start=-3&limit=10&highlight=175"> 9p13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614409"> Spastic paraplegia 46, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614409"> 614409 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609471"> GBA2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609471"> 609471 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/9/210?start=-3&limit=10&highlight=210"> 9q </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607152"> Spastic paraplegia 19, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607152"> 607152 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607152"> SPG19 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607152"> 607152 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/9/548?start=-3&limit=10&highlight=548"> 9q34.11 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620538"> Spastic paraplegia 91, autosomal dominant, with or without cerebellar ataxia </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620538"> 620538 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182810"> SPTAN1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182810"> 182810 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/250?start=-3&limit=10&highlight=250"> 10q22.1-q24.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609041"> Spastic paraplegia 27, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609041"> 609041 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609041"> SPG27 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609041"> 609041 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/427?start=-3&limit=10&highlight=427"> 10q24.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616586"> Spastic paraplegia 9B, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616586"> 616586 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/138250"> ALDH18A1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/138250"> 138250 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/427?start=-3&limit=10&highlight=427"> 10q24.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601162"> Spastic paraplegia 9A, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601162"> 601162 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/138250"> ALDH18A1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/138250"> 138250 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/429?start=-3&limit=10&highlight=429"> 10q24.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615683"> Spastic paraplegia 64, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615683"> 615683 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601752"> ENTPD1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601752"> 601752 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/473?start=-3&limit=10&highlight=473"> 10q24.31 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615681"> Spastic paraplegia 62, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615681"> 615681 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611604"> ERLIN1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611604"> 611604 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/10/530?start=-3&limit=10&highlight=530"> 10q24.32-q24.33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613162"> Spastic paraplegia 45, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613162"> 613162 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600417"> NT5C2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600417"> 600417 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/255?start=-3&limit=10&highlight=255"> 11p14.1-p11.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613364"> ?Spastic paraplegia 41, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613364"> 613364 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613364"> SPG41 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613364"> 613364 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/489?start=-3&limit=10&highlight=489"> 11q12.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270685"> Silver spastic paraplegia syndrome </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270685"> 270685 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606158"> BSCL2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606158"> 606158 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/11/584?start=-3&limit=10&highlight=584"> 11q13.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616907"> Spastic paraplegia 76, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616907"> 616907 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114220"> CAPN1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/114220"> 114220 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/542?start=-3&limit=10&highlight=542"> 12q13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620323"> Spastic paraplegia 70, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620323"> 620323 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/156560"> MARS1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/156560"> 156560 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/547?start=-3&limit=10&highlight=547"> 12q13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604187"> Spastic paraplegia 10, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604187"> 604187 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602821"> KIF5A </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602821"> 602821 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/551?start=-3&limit=10&highlight=551"> 12q13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609195"> Spastic paraplegia 26, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609195"> 609195 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601873"> B4GALNT1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601873"> 601873 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/702?start=-3&limit=10&highlight=702"> 12q23-q24 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613096"> Spastic paraplegia 36, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613096"> 613096 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613096"> SPG36 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613096"> 613096 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/768?start=-3&limit=10&highlight=768"> 12q23.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620911"> Spastic paraplegia 92, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620911"> 620911 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620875"> FICD </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620875"> 620875 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/12/922?start=-3&limit=10&highlight=922"> 12q24.31 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615035"> Spastic paraplegia 55, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615035"> 615035 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613541"> MTRFR </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613541"> 613541 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/13/97?start=-3&limit=10&highlight=97"> 13q13.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/275900"> Troyer syndrome </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/275900"> 275900 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607111"> SPART </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607111"> 607111 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/13/118?start=-3&limit=10&highlight=118"> 13q14 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607584"> Spastic paraplegia 24, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607584"> 607584 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607584"> SPG24 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607584"> 607584 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/13/175?start=-3&limit=10&highlight=175"> 13q14.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620106"> Spastic paraplegia 88, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620106"> 620106 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601892"> KPNA3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/601892"> 601892 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/111?start=-3&limit=10&highlight=111"> 14q12-q21 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611252"> Spastic paraplegia 32, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611252"> 611252 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611252"> SPG32 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611252"> 611252 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/151?start=-3&limit=10&highlight=151"> 14q12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614067"> Spastic paraplegia 52, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614067"> 614067 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607243"> AP4S1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607243"> 607243 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/161?start=-3&limit=10&highlight=161"> 14q13.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620417"> ?Spastic paraplegia 90B, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620417"> 620417 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613540"> SPTSSA </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613540"> 613540 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/161?start=-3&limit=10&highlight=161"> 14q13.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620416"> Spastic paraplegia 90A, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620416"> 620416 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613540"> SPTSSA </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613540"> 613540 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/225?start=-3&limit=10&highlight=225"> 14q22.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182600"> Spastic paraplegia 3A, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/182600"> 182600 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606439"> ATL1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/606439"> 606439 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/244?start=-3&limit=10&highlight=244"> 14q22.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609340"> Spastic paraplegia 28, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/609340"> 609340 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614603"> DDHD1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614603"> 614603 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/333?start=-3&limit=10&highlight=333"> 14q24.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270700"> Spastic paraplegia 15, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/270700"> 270700 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612012"> ZFYVE26 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612012"> 612012 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/14/412?start=-3&limit=10&highlight=412"> 14q24.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619966"> Spastic paraplegia 87, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619966"> 619966 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619953"> TMEM63C </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/619953"> 619953 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/15?start=-3&limit=10&highlight=15"> 15q11.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600363"> Spastic paraplegia 6, autosomal dominant </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/600363"> 600363 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608145"> NIPA1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608145"> 608145 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/168?start=-3&limit=10&highlight=168"> 15q21.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604360"> Spastic paraplegia 11, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/604360"> 604360 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610844"> SPG11 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/610844"> 610844 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/210?start=-3&limit=10&highlight=210"> 15q21.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613744"> Spastic paraplegia 51, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/613744"> 613744 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607244"> AP4E1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607244"> 607244 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/15/289?start=-3&limit=10&highlight=289"> 15q22.31 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/248900"> Mast syndrome </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/248900"> 248900 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608181"> ACP33 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/608181"> 608181 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/16/232?start=-3&limit=10&highlight=232"> 16p12.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615685"> Spastic paraplegia 61, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615685"> 615685 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607669"> ARL6IP1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607669"> 607669 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/16/451?start=-3&limit=10&highlight=451"> 16q13 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620379"> Spastic paraplegia 89, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/620379"> 620379 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603243"> AMFR </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603243"> 603243 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/16/640?start=-3&limit=10&highlight=640"> 16q23.1 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612319"> Spastic paraplegia 35, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612319"> 612319 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611026"> FA2H </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/611026"> 611026 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/16/745?start=-3&limit=10&highlight=745"> 16q24.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607259"> Spastic paraplegia 7, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>, <abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/607259"> 607259 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602783"> PGN </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602783"> 602783 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/17/1047?start=-3&limit=10&highlight=1047"> 17q25.3 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618770"> Spastic paraplegia 82, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/618770"> 618770 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602679"> PCYT2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/602679"> 602679 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/19/207?start=-3&limit=10&highlight=207"> 19p13.2 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612020"> Spastic paraplegia 39, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/612020"> 612020 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603197"> PNPLA6 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/603197"> 603197 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/19/526?start=-3&limit=10&highlight=526"> 19q12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615043"> ?Spastic paraplegia 43, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/615043"> 615043 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614297"> C19orf12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/614297"> 614297 </a>
</span>
</td>
</tr>
<tr>
<td>
<span class="mim-font">
<a href="/geneMap/19/577?start=-3&limit=10&highlight=577"> 19q13.12 </a>
</span>
</td>
<td>
<span class="mim-font">
<a href="/entry/616680"> Spastic paraplegia 75, autosomal recessive </a>
</span>
</td>
<td>
<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<a href="/entry/616680"> 616680 </a>
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<a href="/entry/159460"> MAG </a>
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<span class="mim-font">
<a href="/entry/604805"> Spastic paraplegia 12, autosomal dominant </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<a href="/entry/604805"> 604805 </a>
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<a href="/entry/603183"> RTN2 </a>
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<a href="/entry/603183"> 603183 </a>
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<span class="mim-font">
<a href="/entry/616282"> ?Spastic paraplegia 73, autosomal dominant </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<span class="mim-font">
<a href="/entry/616282"> 616282 </a>
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<a href="/entry/608846"> CPT1C </a>
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<span class="mim-font">
<a href="/entry/608846"> 608846 </a>
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<span class="mim-font">
<a href="/entry/619621"> Spastic paraplegia 84, autosomal recessive </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal recessive">AR</abbr>
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<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<a href="/entry/619621"> 619621 </a>
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<a href="/entry/600286"> PI4KA </a>
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<a href="/entry/600286"> 600286 </a>
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<a href="/geneMap/X/364?start=-3&limit=10&highlight=364"> Xq11.2 </a>
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<a href="/entry/300266"> Spastic paraplegia 16, X-linked, complicated </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="X-linked recessive">XLR</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
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<span class="mim-font">
<a href="/entry/300266"> 300266 </a>
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<span class="mim-font">
<a href="/entry/300266"> SPG16 </a>
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<span class="mim-font">
<a href="/entry/300266"> 300266 </a>
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<a href="/geneMap/X/532?start=-3&limit=10&highlight=532"> Xq22.2 </a>
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<span class="mim-font">
<a href="/entry/312920"> Spastic paraplegia 2, X-linked </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="X-linked recessive">XLR</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<a href="/entry/312920"> 312920 </a>
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<span class="mim-font">
<a href="/entry/300401"> PLP1 </a>
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<span class="mim-font">
<a href="/entry/300401"> 300401 </a>
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<a href="/geneMap/X/598?start=-3&limit=10&highlight=598"> Xq24-q25 </a>
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<span class="mim-font">
<a href="/entry/300750"> Spastic paraplegia 34, X-linked </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="X-linked recessive">XLR</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="2 - The disorder was placed on the map by statistical methods"> 2 </abbr>
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<a href="/entry/300750"> 300750 </a>
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<span class="mim-font">
<a href="/entry/300750"> SPG34 </a>
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<span class="mim-font">
<a href="/entry/300750"> 300750 </a>
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<span class="mim-font">
<a href="/geneMap/X/842?start=-3&limit=10&highlight=842"> Xq28 </a>
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<a href="/entry/303350"> MASA syndrome </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="X-linked recessive">XLR</abbr>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="3 - The molecular basis of the disorder is known"> 3 </abbr>
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<span class="mim-font">
<a href="/entry/303350"> 303350 </a>
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<span class="mim-font">
<a href="/entry/308840"> L1CAM </a>
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<span class="mim-font">
<a href="/entry/308840"> 308840 </a>
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<span class="mim-font">
Not Mapped
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<span class="mim-font">
<a href="/entry/610244"> Spastic paraplegia 33, autosomal dominant </a>
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<span class="mim-font">
<abbr class="mim-tip-hint" title="Autosomal dominant">AD</abbr>
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<span class="mim-font">
</span>
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<span class="mim-font">
<a href="/entry/610244"> 610244 </a>
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<span class="mim-font">
<a href="/entry/610244"> SPG33 </a>
</span>
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<span class="mim-font">
<a href="/entry/610244"> 610244 </a>
</span>
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</tr>
</tbody>
</table>
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<a href="#mimPhenotypicSeriesFold" data-toggle="collapse">&#9650;&nbsp;Close</a>
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because autosomal dominant spastic paraplegia-3A (SPG3A) is caused by heterozygous mutation in the ATL1 gene (<a href="/entry/606439">606439</a>) on chromosome 14q22.</p><p>See also autosomal dominant hereditary sensory neuropathy type 1D (HSN1D; <a href="/entry/613708">613708</a>), an allelic disorder with a different phenotype.</p>
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<a id="description" class="mim-anchor"></a>
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<strong>Description</strong>
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<p>The hereditary spastic paraplegias are a group of clinically and genetically diverse disorders characterized by progressive, usually severe, lower extremity spasticity; see reviews of <a href="#13" class="mim-tip-reference" title="Fink, J. K., Heiman-Patterson, T., Bird, T., Cambi, F., Dube, M.-P., Figlewicz, D. A., Haines, J. L., Hentati, A., Pericak-Vance, M. A., Raskind, W., Rouleau, G. A., Siddique, T. &lt;strong&gt;Hereditary spastic paraplegia: advances in genetic research.&lt;/strong&gt; Neurology 46: 1507-1514, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8649538/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8649538&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/wnl.46.6.1507&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8649538">Fink et al. (1996)</a> and <a href="#14" class="mim-tip-reference" title="Fink, J. K. &lt;strong&gt;Advances in hereditary spastic paraplegia.&lt;/strong&gt; Curr. Opin. Neurol. 10: 313-318, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9266155/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9266155&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1097/00019052-199708000-00006&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9266155">Fink (1997)</a>. <a href="#49" class="mim-tip-reference" title="Zhao, X., Alvarado, D., Rainier, S., Lemons, R., Hedera, P., Weber, C. H., Tukel, T., Apak, M., Heiman-Patterson, T., Ming, L., Bui, M., Fink, J. K. &lt;strong&gt;Mutations in a newly identified GTPase gene cause autosomal dominant hereditary spastic paraplegia.&lt;/strong&gt; Nature Genet. 29: 326-331, 2001.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11685207/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;11685207&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng758&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="11685207">Zhao et al. (2001)</a> noted that hereditary spastic paraplegia in the families of the SPG3A variety is characterized by early onset (before age 10 and usually before age 5 years). <a href="https://pubmed.ncbi.nlm.nih.gov/?term=9266155+8649538+11685207" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>SPG is classified according to both the mode of inheritance (autosomal dominant, autosomal recessive (see <a href="/entry/270800">270800</a>), and X-linked (see <a href="/entry/303350">303350</a>)) and whether progressive spasticity occurs in isolation ('uncomplicated SPG') or with other neurologic abnormalities ('complicated SPG'), including optic neuropathy, retinopathy, extrapyramidal disturbance, dementia, ataxia, ichthyosis, mental retardation, and deafness. The major neuropathologic feature of autosomal dominant, uncomplicated SPG is axonal degeneration that is maximal in the terminal portions of the longest descending and ascending tracts (crossed and uncrossed corticospinal tracts to the legs and fasciculus gracilis, respectively). Spinocerebellar fibers are involved to a lesser extent. Since the description of 'pure' hereditary spastic paraparesis of late onset by <a href="#43" class="mim-tip-reference" title="Strumpell, A. &lt;strong&gt;Die primaere Seitenstrangsklerose (spastische Spinalparalyse).&lt;/strong&gt; Dtsch. Z. Nervenheilk. 27: 291-339, 1904."None>Strumpell (1904)</a>, many 'complicated' forms of the disorder have been reported and the question as to whether a 'pure' form exists has been raised off and on. Probably in large part because of their exceptional length, the pyramidal tracts are unusually vulnerable to both acquired and genetic derangement. Although a majority of reported families have displayed recessive inheritance, 10 to 30% of families have a dominant pattern and in fact recessive inheritance of a 'pure' spastic paraplegia may be rare.</p><p><strong><em>Genetic Heterogeneity of Autosomal Dominant Spastic Paraplegia</em></strong></p><p>
In addition to SPG3A, other forms of autosomal dominant spastic paraplegia for which the molecular basis is known include SPG4 (<a href="/entry/182601">182601</a>), caused by mutation in the SPAST gene (<a href="/entry/604277">604277</a>) on 2p22; SPG6 (<a href="/entry/600363">600363</a>), caused by mutation in the NIPA1 gene (<a href="/entry/608145">608145</a>) on 15q11; SPG8 (<a href="/entry/603563">603563</a>), caused by mutation in the WASHC5 gene (<a href="/entry/610657">610657</a>) on 8q24; SPG9A (<a href="/entry/601162">601162</a>), caused by mutation in the ALDH18A1 gene (<a href="/entry/138250">138250</a>) on 10q24; SPG10 (<a href="/entry/604187">604187</a>), caused by mutation in the KIF5A gene (<a href="/entry/602821">602821</a>) on 12q13; SPG12 (<a href="/entry/604805">604805</a>), caused by mutation in the RTN2 gene (<a href="/entry/603183">603183</a>) on 19q13; SPG13 (<a href="/entry/605280">605280</a>), caused by mutation in the SSPD1 gene (<a href="/entry/118190">118190</a>) on 2q33; SPG17 (<a href="/entry/270685">270685</a>), caused by mutation in the BSCL2 gene (<a href="/entry/606158">606158</a>) on 11q12; SPG18A (<a href="/entry/620512">620512</a>), caused by mutation in the ERLIN2 gene (<a href="/entry/611605">611605</a>) on 8p11; SPG30 (<a href="/entry/610357">610357</a>), caused by mutation in the KIF1A gene (<a href="/entry/601255">601255</a>) on 2q37; SPG31 (<a href="/entry/610250">610250</a>), caused by mutation in the REEP1 gene (<a href="/entry/609139">609139</a>) on 2p11; SPG33 (<a href="/entry/610244">610244</a>), caused by mutation in the ZFYVE27 gene (<a href="/entry/610243">610243</a>) on 10q24; SPG42 (<a href="/entry/612539">612539</a>), caused by mutation in the SLC33A1 gene (<a href="/entry/603690">603690</a>) on 3q25; SPG72 (<a href="/entry/615625">615625</a>), caused by mutation in the REEP2 gene (<a href="/entry/609347">609347</a>) on 5q31; SPG73 (<a href="/entry/616282">616282</a>), caused by mutation in the CPT1C gene (<a href="/entry/608846">608846</a>) on 19q13; SPG79A (<a href="/entry/620221">620221</a>), caused by mutation in the UCHL1 gene (<a href="/entry/191342">191342</a>) on chromosome 4p13; SPG80 (<a href="/entry/618418">618418</a>), caused by mutation in the UBAP1 gene (<a href="/entry/609787">609787</a>) on 9p13; SPG88 (<a href="/entry/620106">620106</a>), caused by mutation in the KPNA3 gene (<a href="/entry/601892">601892</a>) on 13q14; SPG90A (<a href="/entry/620416">620416</a>), caused by mutation in the SPTSSA gene (<a href="/entry/613540">613540</a>) on 14q13; and SPG91 (<a href="/entry/620538">620538</a>), caused by mutation in the SPTAN1 gene (<a href="/entry/182810">182810</a>) on 9q34.</p><p>Autosomal dominant spastic paraplegia has been mapped to chromosomes 9q (SPG19; <a href="/entry/607152">607152</a>), 1p31-p21 (SPG29; <a href="/entry/609727">609727</a>), 12q23-q24 (SPG36; <a href="/entry/613096">613096</a>), 8p21.1-q13.3 (SPG37; <a href="/entry/611945">611945</a>), 4p16-p15 (SPG38; <a href="/entry/612335">612335</a>), and 11p14.1-p11.2 (SPG41; <a href="/entry/613364">613364</a>).</p>
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<p><a href="#27" class="mim-tip-reference" title="Muglia, M., Magariello, A., Nicoletti, G., Patitucci, A., Gabriele, A. L., Conforti, F. L., Mazzei, R., Caracciolo, M., Ardito, B., Lastilla, M., Tedeschi, G., Quattrone, A. &lt;strong&gt;Further evidence that SPG3A gene mutations cause autosomal dominant hereditary spastic paraplegia.&lt;/strong&gt; Ann. Neurol. 51: 794-795, 2002.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12112092/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;12112092&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/ana.10185&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="12112092">Muglia et al. (2002)</a> reported an Italian family with spastic paraplegia and mutation in the ATL1 gene. The phenotype was characterized by a mean age of onset of 8.3 years and progressive lower extremity weakness and spasticity, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12112092" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#9" class="mim-tip-reference" title="Dalpozzo, F., Rossetto, M. G., Boaretto, F., Sartori, E., Mostacciuolo, M. L., Daga, A., Bassi, M. T., Martinuzzi, A. &lt;strong&gt;Infancy onset hereditary spastic paraplegia associated with a novel atlastin mutation.&lt;/strong&gt; Neurology 61: 580-581, 2003. Note: Erratum: Neurology 62: 348 only, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12939451/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;12939451&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/01.wnl.0000078189.73611.df&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="12939451">Dalpozzo et al. (2003)</a> reported a family in which 6 members had an early-onset severe form of spastic paraplegia and mutation in the SPG3A (ATL1) gene. All affected members had onset in infancy with delayed motor milestones, gait impairment, spastic paraparesis, distal atrophy, and lower limb weakness. Because of the early onset, the first patients were misdiagnosed with cerebral palsy, and the index patient (mother of 5 affected members) was unaware that she had a genetically transmissible disease. Two patients had the unusual sign of mild hand atrophy. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12939451" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#12" class="mim-tip-reference" title="Durr, A., Camuzat, A., Colin, E., Tallaksen, C., Hannequin, D., Coutinho, P., Fontaine, B., Rossi, A., Gil, R., Rousselle, C., Ruberg, M., Stevanin, G., Brice, A. &lt;strong&gt;Atlastin1 mutations are frequent in young-onset autosomal dominant spastic paraplegia.&lt;/strong&gt; Arch. Neurol. 61: 1867-1872, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/15596607/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;15596607&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.61.12.1867&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="15596607">Durr et al. (2004)</a> identified mutations in the atlastin gene in 12 of 31 (39%) families in France with early-onset autosomal dominant SPG. Mean age at onset was 4.6 years (range, birth to 14 years). The overall clinical phenotype was of a pure spastic gait disorder. Scoliosis was present in 22% of patients, mild pes cavus in 15%, and brisk upper limb reflexes in 10%. Sensation was not impaired, and only 13% of patients reported decreased vibration sense in the ankles. Two patients had postural tremor in the upper limbs. One family showed incomplete penetrance. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15596607" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#34" class="mim-tip-reference" title="Rainier, S., Sher, C., Reish, O., Thomas, D., Fink, J. K. &lt;strong&gt;De novo occurrence of novel SPG3A/atlastin mutation presenting as cerebral palsy.&lt;/strong&gt; Arch. Neurol. 63: 445-447, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16533974/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;16533974&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.63.3.445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="16533974">Rainier et al. (2006)</a> reported a mother and son with SPG3A confirmed by the finding of a mutation in the ATL1 gene. The mother was a 34-year-old woman with uncomplicated nonprogressive spastic paraplegia since infancy who was originally diagnosed with spastic diplegic cerebral palsy. She was correctly diagnosed with SPG after her son developed similar clinical symptoms at age 10 months. Both patients showed brisk lower limb reflexes, clonus, and spastic gait with normal bulbar and upper limb function, normal bowel and urinary control, and normal intelligence. <a href="#34" class="mim-tip-reference" title="Rainier, S., Sher, C., Reish, O., Thomas, D., Fink, J. K. &lt;strong&gt;De novo occurrence of novel SPG3A/atlastin mutation presenting as cerebral palsy.&lt;/strong&gt; Arch. Neurol. 63: 445-447, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16533974/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;16533974&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.63.3.445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="16533974">Rainier et al. (2006)</a> emphasized the importance of the correct diagnosis of SPG for genetic counseling because the recurrence risk may be as high as 50%. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16533974" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#23" class="mim-tip-reference" title="Ivanova, N., Claeys, K. G., Deconinck, T., Litvinenko, I., Jordanova, A., Auer-Grumbach, M., Haberlova, J., Lofgren, A., Smeyers, G., Nelis, E., Mercelis, R., Plecko, B., and 11 others. &lt;strong&gt;Hereditary spastic paraplegia 3A associated with axonal neuropathy.&lt;/strong&gt; Arch. Neurol. 64: 706-713, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17502470/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17502470&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.64.5.706&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17502470">Ivanova et al. (2007)</a> identified SPG3A mutations in 12 (6.6%) of 182 European or Australian probands with spastic paraplegia. Mean age at onset in SPG3A probands was 3 years. In the 12 probands and 24 affected family members, age of onset was before 10 years of age, except in 1 family with mean onset of 14 years and notable variability (range, 8 to 28 years). In addition to typical features of SPG, 6 (17%) of 36 affected individuals had an axonal, predominantly motor peripheral polyneuropathy, confirmed by pathologic and electrophysiologic studies. The 6 patients with neuropathy originated from 5 unrelated families, and 4 of these patients had pes cavus. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17502470" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Clinical Variability</em></strong></p><p>
<a href="#30" class="mim-tip-reference" title="Orlacchio, A., Montieri, P., Babalini, C., Gaudiello, F., Bernardi, G., Kawarai, T. &lt;strong&gt;Late-onset hereditary spastic paraplegia with thin corpus callosum caused by a new SPG3A mutation. (Letter)&lt;/strong&gt; J. Neurol. 258: 1361-1363, 2011.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/21336785/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;21336785&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1007/s00415-011-5934-z&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="21336785">Orlacchio et al. (2011)</a> reported a 3-generation Zulu family from South Africa with an unusual form of late-onset SPG3A. The 68-year-old proband presented with progressive walking difficulties at age 56, and required a walking aid since age 66. He had mild mental retardation (IQ of 62), urinary incontinence, and thin corpus callosum without cerebellar involvement or white matter abnormalities. Inheritance was clearly autosomal dominant. Other affected family members had a similar disease course, with late onset (range, 38-51 years), spasticity restricted to the lower limbs, mental impairment, and thin corpus callosum on brain imaging. Genomewide linkage analysis followed by direct sequencing identified a heterozygous mutation in exon 12 of the ATL1 gene in affected individuals (R416C; <a href="/entry/606439#0013">606439.0013</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=21336785" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Early Reports of Autosomal Dominant Spastic Paraplegia</em></strong></p><p>
In the Amish of Lancaster County, Pa., a kindred with spastic paraplegia in 3 generations was observed (<a href="#25" class="mim-tip-reference" title="McKusick, V. A. &lt;strong&gt;Personal Communication.&lt;/strong&gt; Baltimore, Md. 1965."None>McKusick, 1965</a>). In this closed community the origin of the de novo mutation could be identified with considerable certainty. The disease was early in onset but very slowly progressive or even static. This same type of congenital stationary familial paraplegia was described in 7 members of 2 generations by <a href="#21" class="mim-tip-reference" title="Hohmann, H. &lt;strong&gt;Die Diplegia spastica infantilis hereditaria und ihre Beziehungen zur familiaeren spastischen Spinalparalyse.&lt;/strong&gt; Nervenarzt 28: 323-325, 1957.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/13517403/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;13517403&lt;/a&gt;]" pmid="13517403">Hohmann (1957)</a>. In contrast to the early-onset, static form of disease in the Amish family, <a href="#46" class="mim-tip-reference" title="Thurmon, T. F., Walker, B. A. &lt;strong&gt;Two distinct types of autosomal dominant spastic paraplegia.&lt;/strong&gt; Birth Defects Orig. Art. Ser. VII(1): 216-218, 1971.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/5173364/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;5173364&lt;/a&gt;]" pmid="5173364">Thurmon and Walker (1971)</a> reported a family from Deer Isle, Maine, in which many affected members had onset in the second or third decade with steady progression of neurologic defect. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=5173364+13517403" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#45" class="mim-tip-reference" title="Thurmon, T. F., He, C., Haskell, C., Thorpe, P., Thurmon, S. G., Rosen, D. R. &lt;strong&gt;Genetic anticipation in a large family with pure autosomal dominant hereditary spastic paraplegia.&lt;/strong&gt; Am. J. Med. Genet. 83: 392-396, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10232750/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10232750&lt;/a&gt;]" pmid="10232750">Thurmon et al. (1999)</a> restudied the large Deer Isle, Maine, family reported by <a href="#46" class="mim-tip-reference" title="Thurmon, T. F., Walker, B. A. &lt;strong&gt;Two distinct types of autosomal dominant spastic paraplegia.&lt;/strong&gt; Birth Defects Orig. Art. Ser. VII(1): 216-218, 1971.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/5173364/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;5173364&lt;/a&gt;]" pmid="5173364">Thurmon and Walker (1971)</a>. Analysis of age of onset was found to be consistent with anticipation in this family. The findings were considered consistent with an unstable trinucleotide repeat occurring primarily in the female germline. On reexamination they were impressed with variable spasticity and Babinski responses. Indeed, spasticity was said not to be a prominent aspect of the disorder; most affected relatives exhibited leg paralysis, with little or no spasticity. Only individuals with long duration of the disorder (more than 22 years) typically manifested a combination of paraplegic gait, hyperreflexia, and Babinski sign. One patient was thought to have been homozygous for the mutation. He was affected with spastic quadriplegia and mental retardation and died at the age of 11.5 years of pneumonia. The parents were consanguineous. The father was known to be affected at the time of report in 1971; since that time the boy's mother had become affected. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=5173364+10232750" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#41" class="mim-tip-reference" title="Schwarz, G. A., Liu, C. N. &lt;strong&gt;Hereditary (familial) spastic paraplegia: further clinical and pathologic observations.&lt;/strong&gt; Arch. Neurol. Psychiat. 75: 144-162, 1956.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/13282534/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;13282534&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneurpsyc.1956.02330200038005&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="13282534">Schwarz and Liu (1956)</a> reported several families including one originally reported by <a href="#3" class="mim-tip-reference" title="Bayley, W. D. &lt;strong&gt;Hereditary spastic paraplegia.&lt;/strong&gt; J. Nerv. Ment. Dis. 24: 697-701, 1897."None>Bayley (1897)</a>, which in 1956 contained 22 affected persons in 6 generations. <a href="#1" class="mim-tip-reference" title="Aagenaes, O. &lt;strong&gt;Hereditary spastic paraplegia: a family with ten injured..&lt;/strong&gt; Acta Psychiat. Scand. 34: 489-494, 1959.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/13791321/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;13791321&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1600-0447.1959.tb07537.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="13791321">Aagenaes (1959)</a> described a family with 31 cases in 4 generations. Prognosis for life was good. Histopathologic changes were found bilaterally in the lateral corticospinal tracts in the thoracic cord and in the fasciculus gracilis. The confusion of the spinocerebellar degenerations is illustrated by the fact that some members of Aagenaes' family had ataxia in addition to spastic paraplegia. <a href="#4" class="mim-tip-reference" title="Behan, W. M. H., Maia, M. &lt;strong&gt;Strumpell&#x27;s familial spastic paraplegia: genetics and neuropathology.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 37: 8-20, 1974.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/4813430/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;4813430&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.37.1.8&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="4813430">Behan and Maia (1974)</a> studied 6 families. In 2 cases autopsy studies were performed. The authors concluded that distal axonal degeneration of the long ascending and descending tracts in the spinal cord is characteristic. <a href="#26" class="mim-tip-reference" title="McLeod, J. G., Morgan, J. A., Reye, C. &lt;strong&gt;Electrophysiological studies in familial spastic paraplegia.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 40: 611-615, 1977.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/903776/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;903776&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.40.6.611&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="903776">McLeod et al. (1977)</a> found no abnormality of motor and sensory nerve conduction in 10 persons in 3 families. In one family 4 generations were affected, in a second, 3 generations, and in a third 2 brothers were affected, possibly with the X-linked form. <a href="#35" class="mim-tip-reference" title="Sack, G. H., Huether, C. A., Garg, N. &lt;strong&gt;Familial spastic paraplegia--clinical and pathologic studies in a large kindred.&lt;/strong&gt; Johns Hopkins Med. J. 143: 117-121, 1978.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/703033/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;703033&lt;/a&gt;]" pmid="703033">Sack et al. (1978)</a> described affected members of 6 generations of a kindred. Onset was in the fourth decade or later, with symptoms of progressive gait difficulties, lower limb spasticity, and weakness. No sensory cerebellar and cranial nerve changes were associated. Anatomic changes in 1 affected person studied at autopsy were confined to the lateral corticospinal tracts and the fasciculus gracilis. <a href="#29" class="mim-tip-reference" title="Opjordsmoen, S., Nyberg-Hansen, R. &lt;strong&gt;Hereditary spastic paraplegia with neurogenic bladder disturbances and syndactyly.&lt;/strong&gt; Acta Neurol. Scand. 61: 35-41, 1980.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/6249060/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;6249060&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1600-0404.1980.tb02993.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="6249060">Opjordsmoen and Nyberg-Hansen (1980)</a> described a family from northern Norway with spastic paraplegia and type III syndactyly (fusion of fingers 4 and 5). The two traits were transmitted together through 3 generations and 9 affected persons. The spastic paraplegia was of unusual type: neurogenic bladder was the earliest manifestation. Indeed, the spastic paraplegia easily escaped attention. Are these two genes linked? <a href="#17" class="mim-tip-reference" title="Harding, A. E. &lt;strong&gt;Hereditary &#x27;pure&#x27; spastic paraplegia: a clinical and genetic study of 22 families.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 44: 871-883, 1981.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7310405/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7310405&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.44.10.871&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="7310405">Harding (1981)</a> reviewed 22 families with 'pure' spastic paraplegia and found autosomal dominant inheritance in 19 and autosomal recessive in 3. She identified 2 forms on the basis of age of onset: type I with onset mainly before age 35 years; type II with onset usually after age 35 years. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=4813430+7310405+13282534+6249060+13791321+703033+903776" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#7" class="mim-tip-reference" title="Cooley, W. C., Melkonian, G., Moses, C., Moeschler, J. B. &lt;strong&gt;Autosomal dominant familial spastic paraplegia: description of a large New England family and a study of management.&lt;/strong&gt; Dev. Med. Child Neurol. 32: 1098-1104, 1990.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/2286310/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;2286310&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1469-8749.1990.tb08530.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="2286310">Cooley et al. (1990)</a> identified 71 affected individuals in 7 generations of a New England family; of these they examined 17 cases. Onset occurred at or before 3 years of age with involvement limited to the lower limbs. They suggested that although in the first year of life the physical examination is normal, in the second year long tract signs are evident on examination and there is a rapid increase in spasticity followed by a delay in walking. Crutches are occasionally necessary in the teens and often necessary after the age of 18. No progression of spasticity was observed after age 7. <a href="#7" class="mim-tip-reference" title="Cooley, W. C., Melkonian, G., Moses, C., Moeschler, J. B. &lt;strong&gt;Autosomal dominant familial spastic paraplegia: description of a large New England family and a study of management.&lt;/strong&gt; Dev. Med. Child Neurol. 32: 1098-1104, 1990.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/2286310/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;2286310&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1469-8749.1990.tb08530.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="2286310">Cooley et al. (1990)</a> reviewed the medical records of 25 family members and examined 16 of them. They felt that children free of signs by age 3 years could be assumed to be unaffected. They further suggested that early, aggressive, habilitative intervention may result in more functional ambulation for the youngest family members. No significant progression was observed after 3 years of age. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=2286310" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#39" class="mim-tip-reference" title="Scheltens, P., Bruyn, R. P. M., Hazenberg, G. J. &lt;strong&gt;A Dutch family with autosomal dominant pure spastic paraparesis (Strumpell&#x27;s disease).&lt;/strong&gt; Acta Neurol. Scand. 82: 169-173, 1990.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/2270744/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;2270744&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1600-0404.1990.tb04484.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="2270744">Scheltens et al. (1990)</a> described a Dutch family with 15 affected members in 3 generations. Onset of clinical signs was in the fourth or fifth decade. The disease was mild; only a few of the affected persons became chairbound late in life. Mild sphincter disturbances were noted in 6 patients. There were no sensory changes. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=2270744" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#31" class="mim-tip-reference" title="Polo, J. M., Calleja, J., Combarros, O., Berciano, J. &lt;strong&gt;Hereditary &#x27;pure&#x27; spastic paraplegia: a study of nine families.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 56: 175-181, 1993.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8382269/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8382269&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.56.2.175&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8382269">Polo et al. (1993)</a> described the genetic and clinical features of 46 patients in 9 families. Inheritance was autosomal dominant in 7, but was thought to be autosomal recessive in 2. The evidence for recessive inheritance was the occurrence in males and females in one generation with consanguineous parents (see <a href="/entry/270800">270800</a>). Among the dominant kindreds, 5 corresponded to type I with onset before 35 years and 2 to type II with onset over 35 years. Irrespective of genetic type, serial evaluation demonstrated that the main symptom was slowly progressive spastic gait, extremely variable in severity, associated in some patients with decreased vibratory sense and micturition disorders (generally as late features). Among dominant families, the disease tended to be more severe in late-onset cases. No patient had symptoms in the upper limbs and plantar responses were flexor in 6 symptomatic patients. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8382269" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#11" class="mim-tip-reference" title="Durr, A., Brice, A., Serdaru, M., Rancurel, G., Derouesne, C., Lyon-Caen, O., Agid, Y., Fontaine, B. &lt;strong&gt;The phenotype of &#x27;pure&#x27; autosomal dominant spastic paraplegia.&lt;/strong&gt; Neurology 44: 1274-1277, 1994.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8035929/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8035929&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/wnl.44.7.1274&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8035929">Durr et al. (1994)</a> studied 23 families with pure autosomal dominant spastic paraplegia and found a unimodal distribution of age of onset. The clinical manifestations of early-onset and late-onset patients were not significantly different. There was no evidence of anticipation or imprinting. Spasticity, sphincter disturbance, decreased vibratory sense, and muscle weakness increased with disease duration. Except for 1 family with electrophysiologic evidence of an axonal neuropathy, there were no clinical features by which the families could be distinguished. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8035929" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#38" class="mim-tip-reference" title="Schady, W., Smith, C. M. L. &lt;strong&gt;Sensory neuropathy in hereditary spastic paraplegia.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 57: 693-698, 1994.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8006649/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8006649&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.57.6.693&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8006649">Schady and Smith (1994)</a> reported a large kindred transmitting typical 'pure' hereditary spastic paraplegia and found electrophysiologic evidence of a sensory polyneuropathy, with normal motor nerve conduction velocities. Sural nerve biopsies demonstrated severe loss of large diameter fibers and relative preservation of small myelinated and nonmyelinated fibers. Members of this family had previously been shown to have delayed central motor conduction (<a href="#36" class="mim-tip-reference" title="Schady, W., Dick, J. P. R., Sheard, A., Crampton, S. &lt;strong&gt;Central motor conduction studies in hereditary spastic paraplegia.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 54: 775-779, 1991.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/1659616/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;1659616&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.54.9.775&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="1659616">Schady et al., 1991</a>). The mild sensory changes, the absence of mutilating ulcers, and the dominant mode of inheritance clearly distinguished the disorder in this family from autosomal recessive hereditary sensory neuropathy with spastic paraplegia (<a href="/entry/256840">256840</a>). Although the sensory changes were subclinical and therefore may have been missed in other cases of 'pure' hereditary spastic paraplegia, the authors speculated that HSP with abnormal sensory action potentials may be a distinct entity. In their own studies of 17 kinships with HSP (<a href="#36" class="mim-tip-reference" title="Schady, W., Dick, J. P. R., Sheard, A., Crampton, S. &lt;strong&gt;Central motor conduction studies in hereditary spastic paraplegia.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 54: 775-779, 1991.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/1659616/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;1659616&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jnnp.54.9.775&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="1659616">Schady et al., 1991</a>; <a href="#37" class="mim-tip-reference" title="Schady, W., Sheard, A. &lt;strong&gt;A quantitative study of sensory function in hereditary spastic paraplegia.&lt;/strong&gt; Brain 113: 709-720, 1990.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/2364265/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;2364265&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1093/brain/113.3.709&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="2364265">Schady and Sheard, 1990</a>), they had found only 2 other patients with abnormal sensory action potentials. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=2364265+8006649+1659616" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="inheritance" class="mim-anchor"></a>
<h4 href="#mimInheritanceFold" id="mimInheritanceToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
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<strong>Inheritance</strong>
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<p>SPG3A is transmitted in an autosomal dominant pattern and may show incomplete penetrance (<a href="#12" class="mim-tip-reference" title="Durr, A., Camuzat, A., Colin, E., Tallaksen, C., Hannequin, D., Coutinho, P., Fontaine, B., Rossi, A., Gil, R., Rousselle, C., Ruberg, M., Stevanin, G., Brice, A. &lt;strong&gt;Atlastin1 mutations are frequent in young-onset autosomal dominant spastic paraplegia.&lt;/strong&gt; Arch. Neurol. 61: 1867-1872, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/15596607/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;15596607&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.61.12.1867&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="15596607">Durr et al., 2004</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15596607" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#48" class="mim-tip-reference" title="Varga, R.-E., Schule, R., Fadel, H., Valenzuela, I., Speziani, F., Gonzalez, M., Rudenskaia, G., Nurnberg, G., Thiele, H., Altmuller, J., Alvarez, V., Gamez, J., Garbern, J. Y., Nurnberg, P., Zuchner, S., Beetz, C. &lt;strong&gt;Do not trust the pedigree: reduced and sex-dependent penetrance at a novel mutation hotspot in ATL1 blurs autosomal dominant inheritance of spastic paraplegia.&lt;/strong&gt; Hum. Mutat. 34: 860-863, 2013.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/23483706/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;23483706&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/humu.22309&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="23483706">Varga et al. (2013)</a> reported 2 unrelated families with hereditary spastic paraplegia in which family pedigree analysis suggested different inheritance patterns, but whole-exome sequencing identified pathogenic mutations in the ATL1 gene, consistent with SPG3A. Four Moroccan sibs in the first family, in which there were several consanguineous marriages, showed onset of lower limb spasticity in the first decade. Two patients also had upper limb involvement. The pedigree pattern suggested autosomal recessive inheritance of the disorder, but whole-exome sequencing identified an ATL1 mutation (R415Q; <a href="/entry/606439#0014">606439.0014</a>): 3 sibs were homozygous and 1 was heterozygous for the mutation. The heterozygous R415Q mutation was then found in 3 unaffected family members and in 2 family members who had very subtle signs of the disorder (hyperreflexia). These findings suggested complete penetrance for the mutation in homozygous state and incomplete penetrance for the mutation in heterozygous state. The second family had previously been reported by <a href="#32" class="mim-tip-reference" title="Raggio, J. F., Thurmon, T. F., Anderson, E. E. &lt;strong&gt;X-linked hereditary spastic paraplegia.&lt;/strong&gt; J. La. State Med. Soc. 125: 4-6, 1973.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/4684346/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;4684346&lt;/a&gt;]" pmid="4684346">Raggio et al. (1973)</a> as showing X-linked transmission of a pure spastic paraplegia. Whole-exome sequencing of 1 of the affected males identified a heterozygous ATL1 mutation (R415W; <a href="/entry/606439#0007">606439.0007</a>). The mutation was then identified in 3 affected and 3 unaffected members of the family, consistent with incomplete penetrance. Two of the unaffected carriers were women, and family history indicated that most unaffected women were obligate carriers. These findings were consistent with sex-associated reduced penetrance of this mutation. <a href="#48" class="mim-tip-reference" title="Varga, R.-E., Schule, R., Fadel, H., Valenzuela, I., Speziani, F., Gonzalez, M., Rudenskaia, G., Nurnberg, G., Thiele, H., Altmuller, J., Alvarez, V., Gamez, J., Garbern, J. Y., Nurnberg, P., Zuchner, S., Beetz, C. &lt;strong&gt;Do not trust the pedigree: reduced and sex-dependent penetrance at a novel mutation hotspot in ATL1 blurs autosomal dominant inheritance of spastic paraplegia.&lt;/strong&gt; Hum. Mutat. 34: 860-863, 2013.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/23483706/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;23483706&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/humu.22309&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="23483706">Varga et al. (2013)</a> also identified heterozygosity for the R415W mutation in 1 of 83 Spanish patients with apparent sporadic HSP and in 2 of 28 Russian patients with dominant HSP. Evidence again suggested incomplete penetrance in these families. Both mutations, c.1244A-G (R415Q) and c.1243C-T (R415W), occur at a CpG nucleotide (on the plus and minus strands, respectively) and thus may represent a mutation hotspot due to spontaneous deamination of methylated cytosines. R415 is a highly conserved residue that does not localize to a known protein domain. <a href="#48" class="mim-tip-reference" title="Varga, R.-E., Schule, R., Fadel, H., Valenzuela, I., Speziani, F., Gonzalez, M., Rudenskaia, G., Nurnberg, G., Thiele, H., Altmuller, J., Alvarez, V., Gamez, J., Garbern, J. Y., Nurnberg, P., Zuchner, S., Beetz, C. &lt;strong&gt;Do not trust the pedigree: reduced and sex-dependent penetrance at a novel mutation hotspot in ATL1 blurs autosomal dominant inheritance of spastic paraplegia.&lt;/strong&gt; Hum. Mutat. 34: 860-863, 2013.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/23483706/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;23483706&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/humu.22309&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="23483706">Varga et al. (2013)</a> suggested that female ATL1 mutation carriers may be more protected from developing disease compared to male carriers. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=23483706+4684346" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Possible Autosomal Recessive Inheritance</em></strong></p><p>
<a href="#24" class="mim-tip-reference" title="Khan, T. N., Klar, J., Tariq, M., Anjum Baig, S., Malik, N. A., Yousaf, R., Baig, S. M., Dahl, N. &lt;strong&gt;Evidence for autosomal recessive inheritance in SPG3A caused by homozygosity for a novel ATL1 missense mutation.&lt;/strong&gt; Europ. J. Hum. Genet. 22: 1180-1184, 2014.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/24473461/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;24473461&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ejhg.2014.5&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="24473461">Khan et al. (2014)</a> reported a consanguineous Pakistani family in which 6 males presented with pure SPG before 2 years of age. Clinical features included spastic gait, toe walking, hyperreflexia of the lower limbs, pes cavus, reduced vibration sense, peripheral numbness and tingling, urinary bladder hyperactivity, and scoliosis. Cognitive function was normal. Whole-exome sequencing identified a homozygous missense variant in the ATL1 gene (R118Q; <a href="/entry/606439#0015">606439.0015</a>) that was present in all affected family members. Seven family members were heterozygous for the variant, all of whom were asymptomatic except for 1 woman who had subclinically reduced vibration sensation. Functional studies of the variant were not performed. <a href="#24" class="mim-tip-reference" title="Khan, T. N., Klar, J., Tariq, M., Anjum Baig, S., Malik, N. A., Yousaf, R., Baig, S. M., Dahl, N. &lt;strong&gt;Evidence for autosomal recessive inheritance in SPG3A caused by homozygosity for a novel ATL1 missense mutation.&lt;/strong&gt; Europ. J. Hum. Genet. 22: 1180-1184, 2014.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/24473461/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;24473461&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ejhg.2014.5&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="24473461">Khan et al. (2014)</a> concluded that SPG3A in this family was transmitted in an autosomal recessive pattern, adding to the clinical complexity of the disorder. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=24473461" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="diagnosis" class="mim-anchor"></a>
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<p><a href="#40" class="mim-tip-reference" title="Schule, R., Holland-Letz, T., Klimpe, S., Kassubek, J., Klopstock, T., Mall, V., Otto, S., Winner, B., Schols, L. &lt;strong&gt;The spastic paraplegia rating scale (SPRS): a reliable and valid measure of disease severity.&lt;/strong&gt; Neurology 67: 430-434, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16894103/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;16894103&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/01.wnl.0000228242.53336.90&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="16894103">Schule et al. (2006)</a> presented a 13-item scale designed to rate functional impairment in pure forms of spastic paraplegia. The scale measures items including walking distance, gait quality, maximum gait speed, spasticity, weakness, and pain. The scale can be performed in an outpatient setting, requires no special equipment, and was found to be a reliable and valid measure of disease severity. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16894103" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="populationGenetics" class="mim-anchor"></a>
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<strong>Population Genetics</strong>
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<p>In a nationwide survey of Japanese patients, <a href="#20" class="mim-tip-reference" title="Hirayama, K., Takayanagi, T., Nakamura, R., Yanagisawa, N., Hattori, T., Kita, K., Yanagimoto, S., Fujita, M., Nagaoka, M., Satomura, Y., Sobue, I., Iizuka, R., Toyokura, Y., Satoyoshi, E. &lt;strong&gt;Spinocerebellar degenerations in Japan: a nationwide epidemiological and clinical study.&lt;/strong&gt; Acta Neurol. Scand. Suppl. 153: 1-22, 1994.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8059595/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8059595&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1600-0404.1994.tb05401.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8059595">Hirayama et al. (1994)</a> estimated the prevalence of all forms of spinocerebellar degeneration to be 4.53 per 100,000; of these, 3.9% were thought to have hereditary spastic paraplegia. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8059595" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="mapping" class="mim-anchor"></a>
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<strong>Mapping</strong>
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<p><a href="#5" class="mim-tip-reference" title="Boustany, R.-M. N., Fleischnick, E., Alper, C. A., Marazita, M. L., Spence, M. A., Martin, J. B., Kolodny, E. H. &lt;strong&gt;The autosomal dominant form of &#x27;pure&#x27; familial spastic paraplegia: clinical findings and linkage analysis of a large pedigree.&lt;/strong&gt; Neurology 37: 910-915, 1987.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/3587641/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;3587641&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/wnl.37.6.910&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="3587641">Boustany et al. (1987)</a> studied a family with 33 members affected with autosomal dominant 'pure' familial spastic paralysis. Linkage studies excluded close linkage to HLA, C8, PGM1, and P blood group. Positive lod scores were obtained with GC (<a href="/entry/139200">139200</a>) and Rh (<a href="/entry/111700">111700</a>). In 1 of 3 families, <a href="#19" class="mim-tip-reference" title="Hazan, J., Lamy, C., Melki, J., Munnich, A., de Recondo, J., Weissenbach, J. &lt;strong&gt;Autosomal dominant familial spastic paraplegia is genetically heterogeneous and one locus maps to chromosome 14q.&lt;/strong&gt; Nature Genet. 5: 163-167, 1993.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8252041/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8252041&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1093-163&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8252041">Hazan et al. (1993)</a> found close linkage to a group of markers on 14q; maximum multipoint lod score = 10. On the other hand, the chromosome 14q candidate region was entirely excluded in the 2 other families, providing evidence of genetic heterogeneity within a clinically homogeneous form of familial spastic paraplegia. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=8252041+3587641" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#16" class="mim-tip-reference" title="Gispert, S., Santos, N., Damen, R., Voit, T., Schulz, J., Klockgether, T., Orozco, G., Kreuz, F., Weissenbach, J., Auburger, G. &lt;strong&gt;Autosomal dominant familial spastic paraplegia: reduction of the FSP1 candidate region on chromosome 14q to 7 cM and locus heterogeneity.&lt;/strong&gt; Am. J. Hum. Genet. 56: 183-187, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7825576/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7825576&lt;/a&gt;]" pmid="7825576">Gispert et al. (1995)</a> reported 3 large German pedigrees with autosomal dominant pure familial spastic paraplegia. One of the pedigrees demonstrated linkage to a 7-cM region on 14q, whereas the other 2 pedigrees were excluded from this region, confirming genetic heterogeneity of the disease. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=7825576" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#10" class="mim-tip-reference" title="Dube, M.-P., Mlodzienski, M. A., Kibar, Z., Farlow, M. R., Ebers, G., Harper, P., Kolodny, E. H., Rouleau, G. A., Figlewicz, D. A. &lt;strong&gt;Hereditary spastic paraplegia: LOD-score considerations for confirmation of linkage in a heterogeneous trait.&lt;/strong&gt; Am. J. Hum. Genet. 60: 625-629, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9042923/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9042923&lt;/a&gt;]" pmid="9042923">Dube et al. (1997)</a> undertook linkage analysis with 21 families with uncomplicated autosomal dominant hereditary spastic paraplegia, testing for linkage to the 3 known loci: SPG3 on 14q, SPG4 on 2p, and SPG4a on 15q. (The chromosome 15-linked form of hereditary spastic paraplegia, referred to as SPG4a by <a href="#10" class="mim-tip-reference" title="Dube, M.-P., Mlodzienski, M. A., Kibar, Z., Farlow, M. R., Ebers, G., Harper, P., Kolodny, E. H., Rouleau, G. A., Figlewicz, D. A. &lt;strong&gt;Hereditary spastic paraplegia: LOD-score considerations for confirmation of linkage in a heterogeneous trait.&lt;/strong&gt; Am. J. Hum. Genet. 60: 625-629, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9042923/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9042923&lt;/a&gt;]" pmid="9042923">Dube et al. (1997)</a>, is referred to here as SPG6.) Linkage to SPG4 was found in 3 of the families and was excluded in several other families by multipoint linkage analysis. They developed a combined analytical approach which permitted conclusive linkage analysis on small-to-medium sized families, under the restrictions of genetic heterogeneity. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9042923" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Among the 33 SPG kindreds reported by the hereditary spastic paraplegia working group (<a href="#13" class="mim-tip-reference" title="Fink, J. K., Heiman-Patterson, T., Bird, T., Cambi, F., Dube, M.-P., Figlewicz, D. A., Haines, J. L., Hentati, A., Pericak-Vance, M. A., Raskind, W., Rouleau, G. A., Siddique, T. &lt;strong&gt;Hereditary spastic paraplegia: advances in genetic research.&lt;/strong&gt; Neurology 46: 1507-1514, 1996.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8649538/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8649538&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/wnl.46.6.1507&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8649538">Fink et al., 1996</a>), linkage to 2p was the most common, being observed in 15 kindreds (45%). Two kindreds (6%) were linked to 14q, and linkage to 15q was observed in 1 kindred (3%). Known SPG loci on these 3 chromosomes were excluded in 15 (45%) of 33 autosomal dominant SPG kindreds. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8649538" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#22" class="mim-tip-reference" title="Huang, S., Zhuyu, Li, H., Labu, Baizhu, Lo, W. H. Y., Fischer, C., Vogel, F. &lt;strong&gt;Another pedigree with pure autosomal dominant spastic paraplegia (AD-FSP) from Tibet mapping to 14q11.2-q24.3.&lt;/strong&gt; Hum. Genet. 100: 620-623, 1997.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/9341882/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;9341882&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1007/s004390050563&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="9341882">Huang et al. (1997)</a> mapped autosomal dominant spastic paresis in a family in Northern Tibet to 14q11.2-q24.3 using microsatellite markers. Linkage to 2p24-p21 (SPG4) and 15q11.1 (SPG6), which have been found for other pedigrees with dominant spastic paresis, was excluded. In all affected individuals in the Tibetan family, signs of spastic paraplegia were confined to the legs. The younger individuals showed a positive Babinski. All managed to survive and provide adequately for their living, despite the extreme conditions in Northern Tibet, at an altitude of about 4,300 m. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=9341882" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><strong><em>Heterogeneity</em></strong></p><p>
<a href="#44" class="mim-tip-reference" title="Subramony, S. H., Nguyen, T. V., Langford, L., Lin, X., Parent, A. D., Zhang, J. &lt;strong&gt;Identification of a new form of autosomal dominant spastic paraplegia. (Letter)&lt;/strong&gt; Clin. Genet. 76: 113-116, 2009.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19519683/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;19519683&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1399-0004.2008.01122.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="19519683">Subramony et al. (2009)</a> reported a large 6-generation Caucasian American family in which 8 living individuals had adult-onset spastic paraplegia inherited in an autosomal dominant pattern. Linkage to 14 known autosomal dominant SPG loci was excluded. The phenotype was relatively homogeneous, with onset after age 35 years (except in 1 individual) of a pure spastic paraplegia mainly affecting the lower limbs and hyperreflexia of the upper limbs. Most individuals had loss of vibratory sense in the lower limbs, and 3 had urinary urgency. Two complained of mild recall deficits at age 77 and 80 years, respectively. There was also evidence of anticipation in later generations. <a href="#44" class="mim-tip-reference" title="Subramony, S. H., Nguyen, T. V., Langford, L., Lin, X., Parent, A. D., Zhang, J. &lt;strong&gt;Identification of a new form of autosomal dominant spastic paraplegia. (Letter)&lt;/strong&gt; Clin. Genet. 76: 113-116, 2009.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/19519683/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;19519683&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/j.1399-0004.2008.01122.x&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="19519683">Subramony et al. (2009)</a> referred to the candidate locus as SPG40. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=19519683" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="molecularGenetics" class="mim-anchor"></a>
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<strong>Molecular Genetics</strong>
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<p><a href="#49" class="mim-tip-reference" title="Zhao, X., Alvarado, D., Rainier, S., Lemons, R., Hedera, P., Weber, C. H., Tukel, T., Apak, M., Heiman-Patterson, T., Ming, L., Bui, M., Fink, J. K. &lt;strong&gt;Mutations in a newly identified GTPase gene cause autosomal dominant hereditary spastic paraplegia.&lt;/strong&gt; Nature Genet. 29: 326-331, 2001.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11685207/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;11685207&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng758&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="11685207">Zhao et al. (2001)</a> analyzed 5 autosomal dominant hereditary spastic paraplegia kindreds showing linkage to the SPG3A locus on 14q. They identified an obligate recombinant individual, permitting a reduction of the interval containing the SPG3A locus to 2.7 cM, and screened candidate genes in this interval for disease-causing mutations (<a href="#33" class="mim-tip-reference" title="Rainier, S., Hedera, P., Alvarado, D., Zhao, X., Kleopa, K. A., Heiman-Patterson, T., Fink, J. K. &lt;strong&gt;Hereditary spastic paraplegia linked to chromosome 14q11-q21: reduction of the SPG3 locus interval from 5.3 to 2.7 cM.&lt;/strong&gt; J. Med. Genet. 38: e39, 2001. Note: Electronic Article.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11694553/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;11694553&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1136/jmg.38.11.e39&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="11694553">Rainier et al., 2001</a>). <a href="#49" class="mim-tip-reference" title="Zhao, X., Alvarado, D., Rainier, S., Lemons, R., Hedera, P., Weber, C. H., Tukel, T., Apak, M., Heiman-Patterson, T., Ming, L., Bui, M., Fink, J. K. &lt;strong&gt;Mutations in a newly identified GTPase gene cause autosomal dominant hereditary spastic paraplegia.&lt;/strong&gt; Nature Genet. 29: 326-331, 2001.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/11685207/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;11685207&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng758&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="11685207">Zhao et al. (2001)</a> reported the identification of disease-specific missense mutations in a novel gene, SPG3A (ATL1; <a href="/entry/606439">606439</a>), in affected individuals from these 5 SPG3A-linked kindreds. SPG3A is expressed predominantly in the central nervous system. It does not have homology to genes that cause other forms of HSP. By contrast, the peptide encoded by SPG3A, termed atlastin, shows significant homology with several GTPases, particularly guanylate-binding protein-1 (GBP1; <a href="/entry/600411">600411</a>), which maps to chromosome 1 and is a member of the dynamin family of large GTPases. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=11694553+11685207" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In an Italian family with HSP characterized by a mean age of onset of 8.3 years and progressive lower extremity weakness and spasticity, <a href="#27" class="mim-tip-reference" title="Muglia, M., Magariello, A., Nicoletti, G., Patitucci, A., Gabriele, A. L., Conforti, F. L., Mazzei, R., Caracciolo, M., Ardito, B., Lastilla, M., Tedeschi, G., Quattrone, A. &lt;strong&gt;Further evidence that SPG3A gene mutations cause autosomal dominant hereditary spastic paraplegia.&lt;/strong&gt; Ann. Neurol. 51: 794-795, 2002.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12112092/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;12112092&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1002/ana.10185&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="12112092">Muglia et al. (2002)</a> identified a mutation in the ATL1 gene (<a href="/entry/606439#0004">606439.0004</a>), which resulted in an arg217-to-gln substitution in a conserved area of GTPases. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12112092" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>In a family with SPG3A, <a href="#9" class="mim-tip-reference" title="Dalpozzo, F., Rossetto, M. G., Boaretto, F., Sartori, E., Mostacciuolo, M. L., Daga, A., Bassi, M. T., Martinuzzi, A. &lt;strong&gt;Infancy onset hereditary spastic paraplegia associated with a novel atlastin mutation.&lt;/strong&gt; Neurology 61: 580-581, 2003. Note: Erratum: Neurology 62: 348 only, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/12939451/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;12939451&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/01.wnl.0000078189.73611.df&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="12939451">Dalpozzo et al. (2003)</a> heterozygous mutation in the SPG3A (ATL1) gene (<a href="/entry/606439#0006">606439.0006</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=12939451" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#12" class="mim-tip-reference" title="Durr, A., Camuzat, A., Colin, E., Tallaksen, C., Hannequin, D., Coutinho, P., Fontaine, B., Rossi, A., Gil, R., Rousselle, C., Ruberg, M., Stevanin, G., Brice, A. &lt;strong&gt;Atlastin1 mutations are frequent in young-onset autosomal dominant spastic paraplegia.&lt;/strong&gt; Arch. Neurol. 61: 1867-1872, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/15596607/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;15596607&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.61.12.1867&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="15596607">Durr et al. (2004)</a> identified mutations in the atlastin gene in 12 of 31 (39%) families in France with early-onset autosomal dominant SPG. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=15596607" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#2" class="mim-tip-reference" title="Abel, A., Fonknechten, N., Hofer, A., Durr, A., Cruaud, C., Voit, T., Weissenbach, J., Brice, A., Klimpe, S., Auburger, G., Hazan, J. &lt;strong&gt;Early onset autosomal dominant spastic paraplegia caused by novel mutations in SPG3A.&lt;/strong&gt; Neurogenetics 5: 239-243, 2004.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/15517445/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;15517445&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1007/s10048-004-0191-2&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="15517445">Abel et al. (2004)</a> identified mutations in the ATL1 gene (see, e.g., <a href="/entry/606439#0001">606439.0001</a>) in affected members of the families reported by <a href="#19" class="mim-tip-reference" title="Hazan, J., Lamy, C., Melki, J., Munnich, A., de Recondo, J., Weissenbach, J. &lt;strong&gt;Autosomal dominant familial spastic paraplegia is genetically heterogeneous and one locus maps to chromosome 14q.&lt;/strong&gt; Nature Genet. 5: 163-167, 1993.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8252041/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8252041&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/ng1093-163&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="8252041">Hazan et al. (1993)</a> and <a href="#16" class="mim-tip-reference" title="Gispert, S., Santos, N., Damen, R., Voit, T., Schulz, J., Klockgether, T., Orozco, G., Kreuz, F., Weissenbach, J., Auburger, G. &lt;strong&gt;Autosomal dominant familial spastic paraplegia: reduction of the FSP1 candidate region on chromosome 14q to 7 cM and locus heterogeneity.&lt;/strong&gt; Am. J. Hum. Genet. 56: 183-187, 1995.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/7825576/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;7825576&lt;/a&gt;]" pmid="7825576">Gispert et al. (1995)</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/?term=7825576+8252041+15517445" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#34" class="mim-tip-reference" title="Rainier, S., Sher, C., Reish, O., Thomas, D., Fink, J. K. &lt;strong&gt;De novo occurrence of novel SPG3A/atlastin mutation presenting as cerebral palsy.&lt;/strong&gt; Arch. Neurol. 63: 445-447, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16533974/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;16533974&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.63.3.445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="16533974">Rainier et al. (2006)</a> reported a mother and son with SPG3A confirmed by the finding of a mutation in the ATL1 gene (L157W; <a href="/entry/606439#0008">606439.0008</a>). Genetic analysis of family members indicated that the mutation occurred de novo in the mother. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16533974" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#28" class="mim-tip-reference" title="Namekawa, M., Ribai, P., Nelson, I., Forlani, S., Fellmann, F., Goizet, C., Depienne, C., Stevanin, G., Ruberg, M., Durr, A., Brice, A. &lt;strong&gt;SPG3A is the most frequent cause of hereditary spastic paraplegia with onset before age 10 years.&lt;/strong&gt; Neurology 66: 112-114, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16401858/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;16401858&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1212/01.wnl.0000191390.20564.8e&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="16401858">Namekawa et al. (2006)</a> stated that 19 mutations in the ATL1 gene had been identified in 40 different families. More than 90% of the mutations were located in exons 4 (12.5%), 7 (27.5%), 8 (17.5%), and 12 (35%). They identified mutations in the ATL1 gene in 7 (13.5%) of 52 families with autosomal dominant SPG with onset before age 20 years and 7 (31.8%) of 22 families with onset before age 10 years. Among a total of 106 mostly European families, no ATL1 mutations were identified in patients with onset after age 10 years. ATL1 mutations were twice as frequent as SPAST (<a href="/entry/604277">604277</a>) mutations in patients with onset before age 10 years. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16401858" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#34" class="mim-tip-reference" title="Rainier, S., Sher, C., Reish, O., Thomas, D., Fink, J. K. &lt;strong&gt;De novo occurrence of novel SPG3A/atlastin mutation presenting as cerebral palsy.&lt;/strong&gt; Arch. Neurol. 63: 445-447, 2006.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/16533974/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;16533974&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.63.3.445&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="16533974">Rainier et al. (2006)</a> stated that SPG3A accounts for approximately 10% of dominantly inherited, uncomplicated SPG. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16533974" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#23" class="mim-tip-reference" title="Ivanova, N., Claeys, K. G., Deconinck, T., Litvinenko, I., Jordanova, A., Auer-Grumbach, M., Haberlova, J., Lofgren, A., Smeyers, G., Nelis, E., Mercelis, R., Plecko, B., and 11 others. &lt;strong&gt;Hereditary spastic paraplegia 3A associated with axonal neuropathy.&lt;/strong&gt; Arch. Neurol. 64: 706-713, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17502470/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17502470&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1001/archneur.64.5.706&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17502470">Ivanova et al. (2007)</a> identified 12 different heterozygous ATL1 mutations in 12 (6.6%) of 182 European or Australian probands with spastic paraplegia. Seven mutations were novel, and 3 were de novo. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17502470" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a href="#Burdick1981" class="mim-tip-reference" title="Burdick, A. B., Owens, L. A., Peterson, C. R. &lt;strong&gt;Slowly progressive autosomal dominant spastic paraplegia with late onset, variable expression and reduced penetrance: a basis for diagnosis and counseling.&lt;/strong&gt; Clin. Genet. 19: 1-7, 1981.">Burdick et al. (1981)</a>; <a href="#Cooley1990" class="mim-tip-reference" title="Cooley, W. C., Rawnsley, E., Melkonian, G., Moses, C., McCann, D., Virgin, B., Coughlan, J., Moeschler, J. B. &lt;strong&gt;Autosomal dominant familial spastic paraplegia: report of a large New England family.&lt;/strong&gt; Clin. Genet. 38: 57-68, 1990.">Cooley et al. (1990)</a>; <a href="#Garland1950" class="mim-tip-reference" title="Garland, H. G., Astley, C. E. &lt;strong&gt;Hereditary spastic paraplegia with amyotrophy and pes cavus.&lt;/strong&gt; J. Neurol. Neurosurg. Psychiat. 13: 130-133, 1950.">Garland and Astley
(1950)</a>; <a href="#Hariga1961" class="mim-tip-reference" title="Hariga, J., Matthys, E. &lt;strong&gt;De la paraplegie spasmodique de Strumpell-Lorrain a l&#x27;amyotrophie de Charcot-Marie-Tooth: (etude d&#x27;une famille).&lt;/strong&gt; J. Genet. Hum. 10: 326-337, 1961.">Hariga and Matthys (1961)</a>; <a href="#Skre1974" class="mim-tip-reference" title="Skre, H. &lt;strong&gt;Hereditary spastic paraplegia in Western Norway.&lt;/strong&gt; Clin. Genet. 6: 165-183, 1974.">Skre (1974)</a>; <a href="#Van1952" class="mim-tip-reference" title="Van Bogaert, L. &lt;strong&gt;Etude genetique sur les paraplegies spasmodiques familiales.&lt;/strong&gt; J. Genet. Hum. 1: 6-23, 1952.">Van Bogaert (1952)</a>
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Aagenaes, O.
<strong>Hereditary spastic paraplegia: a family with ten injured..</strong>
Acta Psychiat. Scand. 34: 489-494, 1959.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/13791321/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">13791321</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=13791321" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/j.1600-0447.1959.tb07537.x" target="_blank">Full Text</a>]
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Abel, A., Fonknechten, N., Hofer, A., Durr, A., Cruaud, C., Voit, T., Weissenbach, J., Brice, A., Klimpe, S., Auburger, G., Hazan, J.
<strong>Early onset autosomal dominant spastic paraplegia caused by novel mutations in SPG3A.</strong>
Neurogenetics 5: 239-243, 2004.
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[<a href="https://doi.org/10.1007/s10048-004-0191-2" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.37.1.8" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.37.6.910" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1111/j.1399-0004.1981.tb00659.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1111/j.1469-8749.1990.tb08530.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1111/j.1399-0004.1990.tb03548.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/01.wnl.0000078189.73611.df" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.44.7.1274" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.61.12.1867" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1212/wnl.46.6.1507" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1097/00019052-199708000-00006" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.13.2.130" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.44.10.871" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1111/j.1600-0404.1994.tb05401.x" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1007/s004390050563" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.40.6.611" target="_blank">Full Text</a>]
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Muglia, M., Magariello, A., Nicoletti, G., Patitucci, A., Gabriele, A. L., Conforti, F. L., Mazzei, R., Caracciolo, M., Ardito, B., Lastilla, M., Tedeschi, G., Quattrone, A.
<strong>Further evidence that SPG3A gene mutations cause autosomal dominant hereditary spastic paraplegia.</strong>
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[<a href="https://doi.org/10.1002/ana.10185" target="_blank">Full Text</a>]
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<strong>SPG3A is the most frequent cause of hereditary spastic paraplegia with onset before age 10 years.</strong>
Neurology 66: 112-114, 2006.
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[<a href="https://doi.org/10.1212/01.wnl.0000191390.20564.8e" target="_blank">Full Text</a>]
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<strong>Hereditary spastic paraplegia with neurogenic bladder disturbances and syndactyly.</strong>
Acta Neurol. Scand. 61: 35-41, 1980.
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[<a href="https://doi.org/10.1111/j.1600-0404.1980.tb02993.x" target="_blank">Full Text</a>]
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<strong>Late-onset hereditary spastic paraplegia with thin corpus callosum caused by a new SPG3A mutation. (Letter)</strong>
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[<a href="https://doi.org/10.1007/s00415-011-5934-z" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.56.2.175" target="_blank">Full Text</a>]
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<strong>Hereditary spastic paraplegia linked to chromosome 14q11-q21: reduction of the SPG3 locus interval from 5.3 to 2.7 cM.</strong>
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[<a href="https://doi.org/10.1136/jmg.38.11.e39" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1001/archneur.63.3.445" target="_blank">Full Text</a>]
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Schady, W., Dick, J. P. R., Sheard, A., Crampton, S.
<strong>Central motor conduction studies in hereditary spastic paraplegia.</strong>
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[<a href="https://doi.org/10.1136/jnnp.54.9.775" target="_blank">Full Text</a>]
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<strong>A quantitative study of sensory function in hereditary spastic paraplegia.</strong>
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[<a href="https://doi.org/10.1093/brain/113.3.709" target="_blank">Full Text</a>]
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[<a href="https://doi.org/10.1136/jnnp.57.6.693" target="_blank">Full Text</a>]
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Scheltens, P., Bruyn, R. P. M., Hazenberg, G. J.
<strong>A Dutch family with autosomal dominant pure spastic paraparesis (Strumpell's disease).</strong>
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/2270744/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">2270744</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=2270744" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/j.1600-0404.1990.tb04484.x" target="_blank">Full Text</a>]
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Schule, R., Holland-Letz, T., Klimpe, S., Kassubek, J., Klopstock, T., Mall, V., Otto, S., Winner, B., Schols, L.
<strong>The spastic paraplegia rating scale (SPRS): a reliable and valid measure of disease severity.</strong>
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[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/16894103/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">16894103</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=16894103" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1212/01.wnl.0000228242.53336.90" target="_blank">Full Text</a>]
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Schwarz, G. A., Liu, C. N.
<strong>Hereditary (familial) spastic paraplegia: further clinical and pathologic observations.</strong>
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[<a href="https://doi.org/10.1001/archneurpsyc.1956.02330200038005" target="_blank">Full Text</a>]
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Skre, H.
<strong>Hereditary spastic paraplegia in Western Norway.</strong>
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[<a href="https://doi.org/10.1111/j.1399-0004.1974.tb00647.x" target="_blank">Full Text</a>]
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Strumpell, A.
<strong>Die primaere Seitenstrangsklerose (spastische Spinalparalyse).</strong>
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[<a href="https://doi.org/10.1111/j.1399-0004.2008.01122.x" target="_blank">Full Text</a>]
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</p>
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<a id="Varga2013" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Varga, R.-E., Schule, R., Fadel, H., Valenzuela, I., Speziani, F., Gonzalez, M., Rudenskaia, G., Nurnberg, G., Thiele, H., Altmuller, J., Alvarez, V., Gamez, J., Garbern, J. Y., Nurnberg, P., Zuchner, S., Beetz, C.
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[<a href="https://doi.org/10.1002/humu.22309" target="_blank">Full Text</a>]
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<a id="Zhao2001" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
Zhao, X., Alvarado, D., Rainier, S., Lemons, R., Hedera, P., Weber, C. H., Tukel, T., Apak, M., Heiman-Patterson, T., Ming, L., Bui, M., Fink, J. K.
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[<a href="https://doi.org/10.1038/ng758" target="_blank">Full Text</a>]
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Cassandra L. Kniffin - updated : 7/25/2013<br>Cassandra L. Kniffin - updated : 3/2/2012<br>Cassandra L. Kniffin - updated : 10/11/2011<br>Cassandra L. Kniffin - updated : 5/24/2010<br>Cassandra L. Kniffin - updated : 3/27/2008<br>Cassandra L. Kniffin - updated : 8/3/2007<br>Cassandra L. Kniffin - updated : 2/6/2007<br>Cassandra L. Kniffin - updated : 4/6/2006<br>Cassandra L. Kniffin - updated : 9/26/2005<br>Cassandra L. Kniffin - updated : 4/11/2005<br>Cassandra L. Kniffin - updated : 9/30/2002<br>Cassandra L. Kniffin - updated : 8/19/2002<br>Victor A. McKusick - updated : 11/1/2001<br>Victor A. McKusick - updated : 4/22/1999<br>Victor A. McKusick - updated : 10/7/1997<br>Victor A. McKusick - updated : 3/13/1997
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Creation Date:
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Victor A. McKusick : 6/2/1986
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carol : 12/22/2023
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carol : 12/20/2023<br>carol : 11/07/2023<br>carol : 08/02/2023<br>alopez : 08/01/2023<br>carol : 06/14/2023<br>alopez : 11/02/2022<br>ckniffin : 10/28/2022<br>carol : 04/17/2020<br>carol : 04/16/2020<br>ckniffin : 04/15/2020<br>carol : 05/10/2019<br>ckniffin : 05/07/2019<br>alopez : 06/05/2018<br>carol : 10/12/2015<br>ckniffin : 10/6/2015<br>carol : 4/8/2015<br>carol : 3/27/2015<br>mcolton : 3/26/2015<br>ckniffin : 3/26/2015<br>carol : 2/17/2015<br>carol : 11/6/2014<br>mcolton : 11/3/2014<br>ckniffin : 11/3/2014<br>ckniffin : 2/4/2014<br>carol : 7/26/2013<br>ckniffin : 7/25/2013<br>carol : 3/2/2012<br>ckniffin : 3/1/2012<br>ckniffin : 10/11/2011<br>terry : 3/18/2011<br>wwang : 3/2/2011<br>wwang : 2/21/2011<br>ckniffin : 1/28/2011<br>carol : 11/24/2010<br>wwang : 6/1/2010<br>ckniffin : 5/24/2010<br>alopez : 4/20/2010<br>ckniffin : 4/16/2010<br>terry : 12/17/2009<br>wwang : 11/9/2009<br>wwang : 11/11/2008<br>wwang : 10/3/2008<br>ckniffin : 10/1/2008<br>wwang : 5/21/2008<br>ckniffin : 4/14/2008<br>wwang : 4/2/2008<br>ckniffin : 3/27/2008<br>wwang : 8/16/2007<br>ckniffin : 8/3/2007<br>wwang : 2/8/2007<br>ckniffin : 2/6/2007<br>wwang : 4/12/2006<br>ckniffin : 4/6/2006<br>wwang : 10/6/2005<br>ckniffin : 9/26/2005<br>wwang : 4/14/2005<br>ckniffin : 4/11/2005<br>terry : 8/17/2004<br>tkritzer : 1/27/2004<br>ckniffin : 1/21/2004<br>ckniffin : 11/15/2002<br>carol : 10/3/2002<br>ckniffin : 9/30/2002<br>carol : 8/22/2002<br>ckniffin : 8/19/2002<br>terry : 3/5/2002<br>alopez : 11/2/2001<br>terry : 11/1/2001<br>mgross : 4/7/2000<br>mgross : 9/24/1999<br>mgross : 9/24/1999<br>alopez : 5/3/1999<br>terry : 4/22/1999<br>dkim : 7/16/1998<br>mark : 10/14/1997<br>terry : 10/7/1997<br>terry : 7/7/1997<br>alopez : 6/27/1997<br>terry : 3/14/1997<br>terry : 3/13/1997<br>terry : 3/12/1997<br>mark : 10/10/1995<br>mimadm : 3/25/1995<br>carol : 11/16/1994<br>terry : 10/18/1994<br>davew : 8/17/1994<br>jason : 7/18/1994
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<strong>#</strong> 182600
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SPASTIC PARAPLEGIA 3, AUTOSOMAL DOMINANT; SPG3A
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<em>Alternative titles; symbols</em>
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SPG3<br />
STRUMPELL DISEASE<br />
FAMILIAL SPASTIC PARAPLEGIA, AUTOSOMAL DOMINANT, 1; FSP1
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<strong>SNOMEDCT:</strong> 782670003; &nbsp;
<strong>ORPHA:</strong> 100984; &nbsp;
<strong>DO:</strong> 0110791; &nbsp;
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<strong>Phenotype-Gene Relationships</strong>
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Location
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Phenotype
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Phenotype <br /> MIM number
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Inheritance
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Phenotype <br /> mapping key
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Gene/Locus
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Gene/Locus <br /> MIM number
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14q22.1
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Spastic paraplegia 3A, autosomal dominant
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182600
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Autosomal dominant
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3
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ATL1
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606439
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<strong>TEXT</strong>
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<p>A number sign (#) is used with this entry because autosomal dominant spastic paraplegia-3A (SPG3A) is caused by heterozygous mutation in the ATL1 gene (606439) on chromosome 14q22.</p><p>See also autosomal dominant hereditary sensory neuropathy type 1D (HSN1D; 613708), an allelic disorder with a different phenotype.</p>
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<strong>Description</strong>
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<p>The hereditary spastic paraplegias are a group of clinically and genetically diverse disorders characterized by progressive, usually severe, lower extremity spasticity; see reviews of Fink et al. (1996) and Fink (1997). Zhao et al. (2001) noted that hereditary spastic paraplegia in the families of the SPG3A variety is characterized by early onset (before age 10 and usually before age 5 years). </p><p>SPG is classified according to both the mode of inheritance (autosomal dominant, autosomal recessive (see 270800), and X-linked (see 303350)) and whether progressive spasticity occurs in isolation ('uncomplicated SPG') or with other neurologic abnormalities ('complicated SPG'), including optic neuropathy, retinopathy, extrapyramidal disturbance, dementia, ataxia, ichthyosis, mental retardation, and deafness. The major neuropathologic feature of autosomal dominant, uncomplicated SPG is axonal degeneration that is maximal in the terminal portions of the longest descending and ascending tracts (crossed and uncrossed corticospinal tracts to the legs and fasciculus gracilis, respectively). Spinocerebellar fibers are involved to a lesser extent. Since the description of 'pure' hereditary spastic paraparesis of late onset by Strumpell (1904), many 'complicated' forms of the disorder have been reported and the question as to whether a 'pure' form exists has been raised off and on. Probably in large part because of their exceptional length, the pyramidal tracts are unusually vulnerable to both acquired and genetic derangement. Although a majority of reported families have displayed recessive inheritance, 10 to 30% of families have a dominant pattern and in fact recessive inheritance of a 'pure' spastic paraplegia may be rare.</p><p><strong><em>Genetic Heterogeneity of Autosomal Dominant Spastic Paraplegia</em></strong></p><p>
In addition to SPG3A, other forms of autosomal dominant spastic paraplegia for which the molecular basis is known include SPG4 (182601), caused by mutation in the SPAST gene (604277) on 2p22; SPG6 (600363), caused by mutation in the NIPA1 gene (608145) on 15q11; SPG8 (603563), caused by mutation in the WASHC5 gene (610657) on 8q24; SPG9A (601162), caused by mutation in the ALDH18A1 gene (138250) on 10q24; SPG10 (604187), caused by mutation in the KIF5A gene (602821) on 12q13; SPG12 (604805), caused by mutation in the RTN2 gene (603183) on 19q13; SPG13 (605280), caused by mutation in the SSPD1 gene (118190) on 2q33; SPG17 (270685), caused by mutation in the BSCL2 gene (606158) on 11q12; SPG18A (620512), caused by mutation in the ERLIN2 gene (611605) on 8p11; SPG30 (610357), caused by mutation in the KIF1A gene (601255) on 2q37; SPG31 (610250), caused by mutation in the REEP1 gene (609139) on 2p11; SPG33 (610244), caused by mutation in the ZFYVE27 gene (610243) on 10q24; SPG42 (612539), caused by mutation in the SLC33A1 gene (603690) on 3q25; SPG72 (615625), caused by mutation in the REEP2 gene (609347) on 5q31; SPG73 (616282), caused by mutation in the CPT1C gene (608846) on 19q13; SPG79A (620221), caused by mutation in the UCHL1 gene (191342) on chromosome 4p13; SPG80 (618418), caused by mutation in the UBAP1 gene (609787) on 9p13; SPG88 (620106), caused by mutation in the KPNA3 gene (601892) on 13q14; SPG90A (620416), caused by mutation in the SPTSSA gene (613540) on 14q13; and SPG91 (620538), caused by mutation in the SPTAN1 gene (182810) on 9q34.</p><p>Autosomal dominant spastic paraplegia has been mapped to chromosomes 9q (SPG19; 607152), 1p31-p21 (SPG29; 609727), 12q23-q24 (SPG36; 613096), 8p21.1-q13.3 (SPG37; 611945), 4p16-p15 (SPG38; 612335), and 11p14.1-p11.2 (SPG41; 613364).</p>
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<strong>Clinical Features</strong>
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<p>Muglia et al. (2002) reported an Italian family with spastic paraplegia and mutation in the ATL1 gene. The phenotype was characterized by a mean age of onset of 8.3 years and progressive lower extremity weakness and spasticity, </p><p>Dalpozzo et al. (2003) reported a family in which 6 members had an early-onset severe form of spastic paraplegia and mutation in the SPG3A (ATL1) gene. All affected members had onset in infancy with delayed motor milestones, gait impairment, spastic paraparesis, distal atrophy, and lower limb weakness. Because of the early onset, the first patients were misdiagnosed with cerebral palsy, and the index patient (mother of 5 affected members) was unaware that she had a genetically transmissible disease. Two patients had the unusual sign of mild hand atrophy. </p><p>Durr et al. (2004) identified mutations in the atlastin gene in 12 of 31 (39%) families in France with early-onset autosomal dominant SPG. Mean age at onset was 4.6 years (range, birth to 14 years). The overall clinical phenotype was of a pure spastic gait disorder. Scoliosis was present in 22% of patients, mild pes cavus in 15%, and brisk upper limb reflexes in 10%. Sensation was not impaired, and only 13% of patients reported decreased vibration sense in the ankles. Two patients had postural tremor in the upper limbs. One family showed incomplete penetrance. </p><p>Rainier et al. (2006) reported a mother and son with SPG3A confirmed by the finding of a mutation in the ATL1 gene. The mother was a 34-year-old woman with uncomplicated nonprogressive spastic paraplegia since infancy who was originally diagnosed with spastic diplegic cerebral palsy. She was correctly diagnosed with SPG after her son developed similar clinical symptoms at age 10 months. Both patients showed brisk lower limb reflexes, clonus, and spastic gait with normal bulbar and upper limb function, normal bowel and urinary control, and normal intelligence. Rainier et al. (2006) emphasized the importance of the correct diagnosis of SPG for genetic counseling because the recurrence risk may be as high as 50%. </p><p>Ivanova et al. (2007) identified SPG3A mutations in 12 (6.6%) of 182 European or Australian probands with spastic paraplegia. Mean age at onset in SPG3A probands was 3 years. In the 12 probands and 24 affected family members, age of onset was before 10 years of age, except in 1 family with mean onset of 14 years and notable variability (range, 8 to 28 years). In addition to typical features of SPG, 6 (17%) of 36 affected individuals had an axonal, predominantly motor peripheral polyneuropathy, confirmed by pathologic and electrophysiologic studies. The 6 patients with neuropathy originated from 5 unrelated families, and 4 of these patients had pes cavus. </p><p><strong><em>Clinical Variability</em></strong></p><p>
Orlacchio et al. (2011) reported a 3-generation Zulu family from South Africa with an unusual form of late-onset SPG3A. The 68-year-old proband presented with progressive walking difficulties at age 56, and required a walking aid since age 66. He had mild mental retardation (IQ of 62), urinary incontinence, and thin corpus callosum without cerebellar involvement or white matter abnormalities. Inheritance was clearly autosomal dominant. Other affected family members had a similar disease course, with late onset (range, 38-51 years), spasticity restricted to the lower limbs, mental impairment, and thin corpus callosum on brain imaging. Genomewide linkage analysis followed by direct sequencing identified a heterozygous mutation in exon 12 of the ATL1 gene in affected individuals (R416C; 606439.0013). </p><p><strong><em>Early Reports of Autosomal Dominant Spastic Paraplegia</em></strong></p><p>
In the Amish of Lancaster County, Pa., a kindred with spastic paraplegia in 3 generations was observed (McKusick, 1965). In this closed community the origin of the de novo mutation could be identified with considerable certainty. The disease was early in onset but very slowly progressive or even static. This same type of congenital stationary familial paraplegia was described in 7 members of 2 generations by Hohmann (1957). In contrast to the early-onset, static form of disease in the Amish family, Thurmon and Walker (1971) reported a family from Deer Isle, Maine, in which many affected members had onset in the second or third decade with steady progression of neurologic defect. </p><p>Thurmon et al. (1999) restudied the large Deer Isle, Maine, family reported by Thurmon and Walker (1971). Analysis of age of onset was found to be consistent with anticipation in this family. The findings were considered consistent with an unstable trinucleotide repeat occurring primarily in the female germline. On reexamination they were impressed with variable spasticity and Babinski responses. Indeed, spasticity was said not to be a prominent aspect of the disorder; most affected relatives exhibited leg paralysis, with little or no spasticity. Only individuals with long duration of the disorder (more than 22 years) typically manifested a combination of paraplegic gait, hyperreflexia, and Babinski sign. One patient was thought to have been homozygous for the mutation. He was affected with spastic quadriplegia and mental retardation and died at the age of 11.5 years of pneumonia. The parents were consanguineous. The father was known to be affected at the time of report in 1971; since that time the boy's mother had become affected. </p><p>Schwarz and Liu (1956) reported several families including one originally reported by Bayley (1897), which in 1956 contained 22 affected persons in 6 generations. Aagenaes (1959) described a family with 31 cases in 4 generations. Prognosis for life was good. Histopathologic changes were found bilaterally in the lateral corticospinal tracts in the thoracic cord and in the fasciculus gracilis. The confusion of the spinocerebellar degenerations is illustrated by the fact that some members of Aagenaes' family had ataxia in addition to spastic paraplegia. Behan and Maia (1974) studied 6 families. In 2 cases autopsy studies were performed. The authors concluded that distal axonal degeneration of the long ascending and descending tracts in the spinal cord is characteristic. McLeod et al. (1977) found no abnormality of motor and sensory nerve conduction in 10 persons in 3 families. In one family 4 generations were affected, in a second, 3 generations, and in a third 2 brothers were affected, possibly with the X-linked form. Sack et al. (1978) described affected members of 6 generations of a kindred. Onset was in the fourth decade or later, with symptoms of progressive gait difficulties, lower limb spasticity, and weakness. No sensory cerebellar and cranial nerve changes were associated. Anatomic changes in 1 affected person studied at autopsy were confined to the lateral corticospinal tracts and the fasciculus gracilis. Opjordsmoen and Nyberg-Hansen (1980) described a family from northern Norway with spastic paraplegia and type III syndactyly (fusion of fingers 4 and 5). The two traits were transmitted together through 3 generations and 9 affected persons. The spastic paraplegia was of unusual type: neurogenic bladder was the earliest manifestation. Indeed, the spastic paraplegia easily escaped attention. Are these two genes linked? Harding (1981) reviewed 22 families with 'pure' spastic paraplegia and found autosomal dominant inheritance in 19 and autosomal recessive in 3. She identified 2 forms on the basis of age of onset: type I with onset mainly before age 35 years; type II with onset usually after age 35 years. </p><p>Cooley et al. (1990) identified 71 affected individuals in 7 generations of a New England family; of these they examined 17 cases. Onset occurred at or before 3 years of age with involvement limited to the lower limbs. They suggested that although in the first year of life the physical examination is normal, in the second year long tract signs are evident on examination and there is a rapid increase in spasticity followed by a delay in walking. Crutches are occasionally necessary in the teens and often necessary after the age of 18. No progression of spasticity was observed after age 7. Cooley et al. (1990) reviewed the medical records of 25 family members and examined 16 of them. They felt that children free of signs by age 3 years could be assumed to be unaffected. They further suggested that early, aggressive, habilitative intervention may result in more functional ambulation for the youngest family members. No significant progression was observed after 3 years of age. </p><p>Scheltens et al. (1990) described a Dutch family with 15 affected members in 3 generations. Onset of clinical signs was in the fourth or fifth decade. The disease was mild; only a few of the affected persons became chairbound late in life. Mild sphincter disturbances were noted in 6 patients. There were no sensory changes. </p><p>Polo et al. (1993) described the genetic and clinical features of 46 patients in 9 families. Inheritance was autosomal dominant in 7, but was thought to be autosomal recessive in 2. The evidence for recessive inheritance was the occurrence in males and females in one generation with consanguineous parents (see 270800). Among the dominant kindreds, 5 corresponded to type I with onset before 35 years and 2 to type II with onset over 35 years. Irrespective of genetic type, serial evaluation demonstrated that the main symptom was slowly progressive spastic gait, extremely variable in severity, associated in some patients with decreased vibratory sense and micturition disorders (generally as late features). Among dominant families, the disease tended to be more severe in late-onset cases. No patient had symptoms in the upper limbs and plantar responses were flexor in 6 symptomatic patients. </p><p>Durr et al. (1994) studied 23 families with pure autosomal dominant spastic paraplegia and found a unimodal distribution of age of onset. The clinical manifestations of early-onset and late-onset patients were not significantly different. There was no evidence of anticipation or imprinting. Spasticity, sphincter disturbance, decreased vibratory sense, and muscle weakness increased with disease duration. Except for 1 family with electrophysiologic evidence of an axonal neuropathy, there were no clinical features by which the families could be distinguished. </p><p>Schady and Smith (1994) reported a large kindred transmitting typical 'pure' hereditary spastic paraplegia and found electrophysiologic evidence of a sensory polyneuropathy, with normal motor nerve conduction velocities. Sural nerve biopsies demonstrated severe loss of large diameter fibers and relative preservation of small myelinated and nonmyelinated fibers. Members of this family had previously been shown to have delayed central motor conduction (Schady et al., 1991). The mild sensory changes, the absence of mutilating ulcers, and the dominant mode of inheritance clearly distinguished the disorder in this family from autosomal recessive hereditary sensory neuropathy with spastic paraplegia (256840). Although the sensory changes were subclinical and therefore may have been missed in other cases of 'pure' hereditary spastic paraplegia, the authors speculated that HSP with abnormal sensory action potentials may be a distinct entity. In their own studies of 17 kinships with HSP (Schady et al., 1991; Schady and Sheard, 1990), they had found only 2 other patients with abnormal sensory action potentials. </p>
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<strong>Inheritance</strong>
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<p>SPG3A is transmitted in an autosomal dominant pattern and may show incomplete penetrance (Durr et al., 2004). </p><p>Varga et al. (2013) reported 2 unrelated families with hereditary spastic paraplegia in which family pedigree analysis suggested different inheritance patterns, but whole-exome sequencing identified pathogenic mutations in the ATL1 gene, consistent with SPG3A. Four Moroccan sibs in the first family, in which there were several consanguineous marriages, showed onset of lower limb spasticity in the first decade. Two patients also had upper limb involvement. The pedigree pattern suggested autosomal recessive inheritance of the disorder, but whole-exome sequencing identified an ATL1 mutation (R415Q; 606439.0014): 3 sibs were homozygous and 1 was heterozygous for the mutation. The heterozygous R415Q mutation was then found in 3 unaffected family members and in 2 family members who had very subtle signs of the disorder (hyperreflexia). These findings suggested complete penetrance for the mutation in homozygous state and incomplete penetrance for the mutation in heterozygous state. The second family had previously been reported by Raggio et al. (1973) as showing X-linked transmission of a pure spastic paraplegia. Whole-exome sequencing of 1 of the affected males identified a heterozygous ATL1 mutation (R415W; 606439.0007). The mutation was then identified in 3 affected and 3 unaffected members of the family, consistent with incomplete penetrance. Two of the unaffected carriers were women, and family history indicated that most unaffected women were obligate carriers. These findings were consistent with sex-associated reduced penetrance of this mutation. Varga et al. (2013) also identified heterozygosity for the R415W mutation in 1 of 83 Spanish patients with apparent sporadic HSP and in 2 of 28 Russian patients with dominant HSP. Evidence again suggested incomplete penetrance in these families. Both mutations, c.1244A-G (R415Q) and c.1243C-T (R415W), occur at a CpG nucleotide (on the plus and minus strands, respectively) and thus may represent a mutation hotspot due to spontaneous deamination of methylated cytosines. R415 is a highly conserved residue that does not localize to a known protein domain. Varga et al. (2013) suggested that female ATL1 mutation carriers may be more protected from developing disease compared to male carriers. </p><p><strong><em>Possible Autosomal Recessive Inheritance</em></strong></p><p>
Khan et al. (2014) reported a consanguineous Pakistani family in which 6 males presented with pure SPG before 2 years of age. Clinical features included spastic gait, toe walking, hyperreflexia of the lower limbs, pes cavus, reduced vibration sense, peripheral numbness and tingling, urinary bladder hyperactivity, and scoliosis. Cognitive function was normal. Whole-exome sequencing identified a homozygous missense variant in the ATL1 gene (R118Q; 606439.0015) that was present in all affected family members. Seven family members were heterozygous for the variant, all of whom were asymptomatic except for 1 woman who had subclinically reduced vibration sensation. Functional studies of the variant were not performed. Khan et al. (2014) concluded that SPG3A in this family was transmitted in an autosomal recessive pattern, adding to the clinical complexity of the disorder. </p>
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<strong>Diagnosis</strong>
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<p>Schule et al. (2006) presented a 13-item scale designed to rate functional impairment in pure forms of spastic paraplegia. The scale measures items including walking distance, gait quality, maximum gait speed, spasticity, weakness, and pain. The scale can be performed in an outpatient setting, requires no special equipment, and was found to be a reliable and valid measure of disease severity. </p>
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<strong>Population Genetics</strong>
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<p>In a nationwide survey of Japanese patients, Hirayama et al. (1994) estimated the prevalence of all forms of spinocerebellar degeneration to be 4.53 per 100,000; of these, 3.9% were thought to have hereditary spastic paraplegia. </p>
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<strong>Mapping</strong>
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<span class="mim-text-font">
<p>Boustany et al. (1987) studied a family with 33 members affected with autosomal dominant 'pure' familial spastic paralysis. Linkage studies excluded close linkage to HLA, C8, PGM1, and P blood group. Positive lod scores were obtained with GC (139200) and Rh (111700). In 1 of 3 families, Hazan et al. (1993) found close linkage to a group of markers on 14q; maximum multipoint lod score = 10. On the other hand, the chromosome 14q candidate region was entirely excluded in the 2 other families, providing evidence of genetic heterogeneity within a clinically homogeneous form of familial spastic paraplegia. </p><p>Gispert et al. (1995) reported 3 large German pedigrees with autosomal dominant pure familial spastic paraplegia. One of the pedigrees demonstrated linkage to a 7-cM region on 14q, whereas the other 2 pedigrees were excluded from this region, confirming genetic heterogeneity of the disease. </p><p>Dube et al. (1997) undertook linkage analysis with 21 families with uncomplicated autosomal dominant hereditary spastic paraplegia, testing for linkage to the 3 known loci: SPG3 on 14q, SPG4 on 2p, and SPG4a on 15q. (The chromosome 15-linked form of hereditary spastic paraplegia, referred to as SPG4a by Dube et al. (1997), is referred to here as SPG6.) Linkage to SPG4 was found in 3 of the families and was excluded in several other families by multipoint linkage analysis. They developed a combined analytical approach which permitted conclusive linkage analysis on small-to-medium sized families, under the restrictions of genetic heterogeneity. </p><p>Among the 33 SPG kindreds reported by the hereditary spastic paraplegia working group (Fink et al., 1996), linkage to 2p was the most common, being observed in 15 kindreds (45%). Two kindreds (6%) were linked to 14q, and linkage to 15q was observed in 1 kindred (3%). Known SPG loci on these 3 chromosomes were excluded in 15 (45%) of 33 autosomal dominant SPG kindreds. </p><p>Huang et al. (1997) mapped autosomal dominant spastic paresis in a family in Northern Tibet to 14q11.2-q24.3 using microsatellite markers. Linkage to 2p24-p21 (SPG4) and 15q11.1 (SPG6), which have been found for other pedigrees with dominant spastic paresis, was excluded. In all affected individuals in the Tibetan family, signs of spastic paraplegia were confined to the legs. The younger individuals showed a positive Babinski. All managed to survive and provide adequately for their living, despite the extreme conditions in Northern Tibet, at an altitude of about 4,300 m. </p><p><strong><em>Heterogeneity</em></strong></p><p>
Subramony et al. (2009) reported a large 6-generation Caucasian American family in which 8 living individuals had adult-onset spastic paraplegia inherited in an autosomal dominant pattern. Linkage to 14 known autosomal dominant SPG loci was excluded. The phenotype was relatively homogeneous, with onset after age 35 years (except in 1 individual) of a pure spastic paraplegia mainly affecting the lower limbs and hyperreflexia of the upper limbs. Most individuals had loss of vibratory sense in the lower limbs, and 3 had urinary urgency. Two complained of mild recall deficits at age 77 and 80 years, respectively. There was also evidence of anticipation in later generations. Subramony et al. (2009) referred to the candidate locus as SPG40. </p>
</span>
<div>
<br />
</div>
<div>
<h4>
<span class="mim-font">
<strong>Molecular Genetics</strong>
</span>
</h4>
</div>
<span class="mim-text-font">
<p>Zhao et al. (2001) analyzed 5 autosomal dominant hereditary spastic paraplegia kindreds showing linkage to the SPG3A locus on 14q. They identified an obligate recombinant individual, permitting a reduction of the interval containing the SPG3A locus to 2.7 cM, and screened candidate genes in this interval for disease-causing mutations (Rainier et al., 2001). Zhao et al. (2001) reported the identification of disease-specific missense mutations in a novel gene, SPG3A (ATL1; 606439), in affected individuals from these 5 SPG3A-linked kindreds. SPG3A is expressed predominantly in the central nervous system. It does not have homology to genes that cause other forms of HSP. By contrast, the peptide encoded by SPG3A, termed atlastin, shows significant homology with several GTPases, particularly guanylate-binding protein-1 (GBP1; 600411), which maps to chromosome 1 and is a member of the dynamin family of large GTPases. </p><p>In an Italian family with HSP characterized by a mean age of onset of 8.3 years and progressive lower extremity weakness and spasticity, Muglia et al. (2002) identified a mutation in the ATL1 gene (606439.0004), which resulted in an arg217-to-gln substitution in a conserved area of GTPases. </p><p>In a family with SPG3A, Dalpozzo et al. (2003) heterozygous mutation in the SPG3A (ATL1) gene (606439.0006). </p><p>Durr et al. (2004) identified mutations in the atlastin gene in 12 of 31 (39%) families in France with early-onset autosomal dominant SPG. </p><p>Abel et al. (2004) identified mutations in the ATL1 gene (see, e.g., 606439.0001) in affected members of the families reported by Hazan et al. (1993) and Gispert et al. (1995). </p><p>Rainier et al. (2006) reported a mother and son with SPG3A confirmed by the finding of a mutation in the ATL1 gene (L157W; 606439.0008). Genetic analysis of family members indicated that the mutation occurred de novo in the mother. </p><p>Namekawa et al. (2006) stated that 19 mutations in the ATL1 gene had been identified in 40 different families. More than 90% of the mutations were located in exons 4 (12.5%), 7 (27.5%), 8 (17.5%), and 12 (35%). They identified mutations in the ATL1 gene in 7 (13.5%) of 52 families with autosomal dominant SPG with onset before age 20 years and 7 (31.8%) of 22 families with onset before age 10 years. Among a total of 106 mostly European families, no ATL1 mutations were identified in patients with onset after age 10 years. ATL1 mutations were twice as frequent as SPAST (604277) mutations in patients with onset before age 10 years. </p><p>Rainier et al. (2006) stated that SPG3A accounts for approximately 10% of dominantly inherited, uncomplicated SPG. </p><p>Ivanova et al. (2007) identified 12 different heterozygous ATL1 mutations in 12 (6.6%) of 182 European or Australian probands with spastic paraplegia. Seven mutations were novel, and 3 were de novo. </p>
</span>
<div>
<br />
</div>
</div>
<div>
<h4>
<span class="mim-font">
<strong>See Also:</strong>
</span>
</h4>
<span class="mim-text-font">
Burdick et al. (1981); Cooley et al. (1990); Garland and Astley
(1950); Hariga and Matthys (1961); Skre (1974); Van Bogaert (1952)
</span>
<div>
<br />
</div>
</div>
<div>
<h4>
<span class="mim-font">
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<strong>Familial spastic paraplegia--clinical and pathologic studies in a large kindred.</strong>
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Strumpell, A.
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<li>
<p class="mim-text-font">
Thurmon, T. F., Walker, B. A.
<strong>Two distinct types of autosomal dominant spastic paraplegia.</strong>
Birth Defects Orig. Art. Ser. VII(1): 216-218, 1971.
[PubMed: 5173364]
</p>
</li>
<li>
<p class="mim-text-font">
Van Bogaert, L.
<strong>Etude genetique sur les paraplegies spasmodiques familiales.</strong>
J. Genet. Hum. 1: 6-23, 1952.
[PubMed: 12981238]
</p>
</li>
<li>
<p class="mim-text-font">
Varga, R.-E., Schule, R., Fadel, H., Valenzuela, I., Speziani, F., Gonzalez, M., Rudenskaia, G., Nurnberg, G., Thiele, H., Altmuller, J., Alvarez, V., Gamez, J., Garbern, J. Y., Nurnberg, P., Zuchner, S., Beetz, C.
<strong>Do not trust the pedigree: reduced and sex-dependent penetrance at a novel mutation hotspot in ATL1 blurs autosomal dominant inheritance of spastic paraplegia.</strong>
Hum. Mutat. 34: 860-863, 2013.
[PubMed: 23483706]
[Full Text: https://doi.org/10.1002/humu.22309]
</p>
</li>
<li>
<p class="mim-text-font">
Zhao, X., Alvarado, D., Rainier, S., Lemons, R., Hedera, P., Weber, C. H., Tukel, T., Apak, M., Heiman-Patterson, T., Ming, L., Bui, M., Fink, J. K.
<strong>Mutations in a newly identified GTPase gene cause autosomal dominant hereditary spastic paraplegia.</strong>
Nature Genet. 29: 326-331, 2001.
[PubMed: 11685207]
[Full Text: https://doi.org/10.1038/ng758]
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Cassandra L. Kniffin - updated : 11/3/2014<br>Cassandra L. Kniffin - updated : 7/25/2013<br>Cassandra L. Kniffin - updated : 3/2/2012<br>Cassandra L. Kniffin - updated : 10/11/2011<br>Cassandra L. Kniffin - updated : 5/24/2010<br>Cassandra L. Kniffin - updated : 3/27/2008<br>Cassandra L. Kniffin - updated : 8/3/2007<br>Cassandra L. Kniffin - updated : 2/6/2007<br>Cassandra L. Kniffin - updated : 4/6/2006<br>Cassandra L. Kniffin - updated : 9/26/2005<br>Cassandra L. Kniffin - updated : 4/11/2005<br>Cassandra L. Kniffin - updated : 9/30/2002<br>Cassandra L. Kniffin - updated : 8/19/2002<br>Victor A. McKusick - updated : 11/1/2001<br>Victor A. McKusick - updated : 4/22/1999<br>Victor A. McKusick - updated : 10/7/1997<br>Victor A. McKusick - updated : 3/13/1997
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Victor A. McKusick : 6/2/1986
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